题干

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项,选项中有两项为多余选项。People, like all living things, need food. Food gives us the nutrients our bodies need.【小题1】    .Energy is needed to carry out the life processes.Our bodies cannot use the nutrients or energy in food unless the food is changed. The changing of food into a form the body can use is called digestion.What does digestion do? 【小题2】 Digestion also changes the chemicals of food. It changes large, complex food molecules(微粒)into smaller, simpler ones.【小题3】Digestion takes place in the digestive tract. The digestive tract is a long, winding tube in your body. If stretched out, the digestive tract would be more than 9 meters (30 feet) long.What are the parts of the digestive tract? The parts of the digestive tract are: the mouth, the food pipe , the stomach, the small intestine(肠),and the large intestine.There are many organs along the digestive tracts, such as the liver. 【小题4】The digestive tract and the other digestive organs make up your digestive system.Food enters the body through the mouth. Waste materials (undigested food) leave the body through the anus(肛门).The anus is at the end of the large intestine.Digestion is a step-by-step process.【小题5】 It takes food from one to two days to pass through the entire digestive tract.
A.It also gives us energy.
B.It does not take place quickly.
C.Where does digestion take place?
D.Does the food also give us much strength?
E.Digestion breaks down large pieces of food into smaller pieces.
F.These organs are not part of the digestive tract, but they help in digestion.
G.Although they don't belong to the digestive tract, they help us fight diseases.
 
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同类题1

   A calorie is a unit of energy, not a measure of weight or nutrient density. The calories you see on nutrition labels,however,are actually kilocalories. The calories on food packaging always refer to kilocalories, even though it just says “calories”. One kilocalorie is the amount of energy required to heat 1 kilogram of water by 1 degree Celsius. Calories in our food all come from one of the three nutrients: fats, carbohydrates and proteins.

In 1990, the U. S. government passed the Nutrition Labeling and Education Act, which means that before any packaged food in the U. S. hits the shelves, food scientists have to measure its nutrients and calories. One way to do this is using a tool called bomb calorimeter(弹氧热卡计). This tool directly measures the amount of energy that a food contains. To use this tool, scientists place the food in question in a sealed(密封的)container surrounded by water and heat it until the food is completely burned off. Scientists then record the rise in water temperature to determine the number of calories in the product.

Food scientists also rely on a calculation developed by the 19th-century U. S. chemist Wilbur Olin Atwater to indirectly estimate the number of calories in food products. Calorimeters don’t take into account that humans lose some calories through heat and feces(类便). Atwater’s experiments found that proteins and carbohydrates each have about 4 calories per gram and fats have 9 calories per gram.

However, some experts say that the Atwater system is outdated and inaccurate. A 2012 study found that the energy content of certain foods, such as nuts, could not be accurately calculated by the Atwater system. Besides, it does not take into account the digestive process, but assumes the complete conversion of nutrients to energy.

【小题1】What can we learn about the unit of energy on nutrition labels?
A.It actually means calories.
B.It refers to kilocalories.
C.It reads kilograms.
D.It employs degrees.
【小题2】What should be done to measure the amount of calories according to the calorimeter?
A.Heat the food in an open container until the food is completely burned off.
B.Take the calories through heat and feces into consideration.
C.Learn the calculation developed by Wilbur Olin Atwater.
D.Calculate the amount of energy in food products directly.
【小题3】How many calories does a food containing 10 grams of proteins and 5 grams of fats have according to the Atwater system?
A.About 40.B.About 45.
C.About 85.D.About 130.
【小题4】What would be the best title for the text?
A.How Are Calorie Counts Calculated?
B.Where do Calories Come from?
C.Can Nutrients Be Converted to Energy Totally?
D.Nutrients and Calories Listed on a Food Label

同类题2

   Skywriting is a form of advertising in which a pilot is bound to spell out a brief slogan or catchphrase in letters formed by smoke. In general, a customer would choose a specific place and time for the skywriting to appear. The message would only last as long as winds are relatively calm and the sky is clear. Single plane skywriting has largely been replaced by multi-plane "skytyping" , a computer-controlled method involving puffs of smoke from a row of aircraft.

The first official skywriting show took place over New York City in November of 1922. A skywriting pioneer and Royal Air Force(RAF)pilot named John Savage sat with the president of the American Tobacco Company, George Hill, as a fellow RAF ace pilot named Captain Cyril Turner flew into position over New York City. Captain Turner spelled out "HELLO USA CALL VANDERBILT 7200" in white smoke. Over47,000 people called the number, which happened to be the Vanderbilt Hotel where George Hill was staying. Hill became convinced that the skywriting advertisements would work well to promote his Lucky Strike cigarettes.

Skywriting continued to grow in popularity as both an advertising medium and a personal message service. Customers could request anything from "Eat at Joe's" to "Will You Marry Me?"Messages and slogans would naturally have to remain short, but even a simple phone number could produce a lot of curious potential(潜在的)customers for a small investment.

The development of the national highway system after WW Ⅱ spelled the beginning of the end for the skywriting industry. Instead of posting a few words in the sky, advertisers could now fill entire billboards with all sorts of pictures. Thousands of captive audience would pass by these new advertising signs every day, unlike the precious few who would come across a typical skywriting message. Many aerial(空中的)advertising companies turned to permanent banners(横幅)pulled behind low-flying aircraft instead.

Some skywriting is still performed today, although only a select number of pilots have the skills necessary for the job.

【小题1】What do we know about skywriting?
A.It is made up of smoke and clouds.
B.It is performed by computers at present.
C.It appears where the pilot wants.
D.It is a kind of ad made in the sky.
【小题2】The third paragraph suggests that skywriting ________.
A.satisfied all of the needs of customers
B.was an effective advertising style
C.appealed to few customers
D.ended up with a message service
【小题3】Why did advertisers give up skywriting?
A.Because skywriting was too expensive to advertise.
B.Because planes were greatly reduced after WWⅡ.
C.Because billboards could attract more audience.
D.Because it wasn't easy to do such a thing.
【小题4】What might be the most suitable title for the passage?
A.Why people need skywriting
B.How to do skywriting
C.When it is good to do skywriting
D.What skywriting is

同类题3

Internet use appears to cause a decline in psychological well-being(安康), according to research at Carnegie Mellon University.
Even people who spent just a few hours a week on the Internet experienced more depression and loneliness than those who logged on less frequently, the two-year study showed. And it wasn’t that people who were already feeling bad spent more time on the Internet, but that using the Net actually appeared to cause the bad feeling.
Researchers are puzzling over the results, which were completely contrary to their expectations. They expected that the net would prove socially healthier than television, since the Net allows users to choose their information and to communicate with others.
The fact that Internet use reduces time available for family and friends may account for the drop in well-being, researchers suggested. Faceless, bodiless “virtual”(虚拟的)communication may be less psychologically satisfying than actual conversation, and the relationship formed through it may be shallower. Another possibility is that exposure to the wider world via the Net makes users less satisfied with their lives.
“But it’s important to remember this is not about the technology  per se; it’s about how it is used,” says psychologist Christine Riley of Intel, one of the study’s sponsors. “It really points to the need for considering social effects in terms of how you design applications and services for technology.”
【小题1】The best title for this passage would be ________.
A.Internet may Cause Depression
B.The Dark Side of Internet
C.How to Use Technology Properly
D.The Importance of Psychological Well-being
【小题2】Internet use may cause a decline in psychological well-being because ________.
A.people who were already feeling bad spend more time on the Internet
B.Internet users thought the world was wider than it really was
C.people were too eager to turn the “virtual” communication into reality
D.people have less time for actual communication with their family and friends
【小题3】What does the underlined Latin word “per se” (in Para. 5) mean?
A.probablyB.absolutely
C.oneselfD.itself
【小题4】What’s the tone of the passage?
A.Optimistic.B.Critical.
C.Objective.D.Pessimistic.

同类题4

   We all know the keys to living longer:eating healthily,exercising daily,and avoiding bad lifestyle habits,but do you know that practicing these simple steps when you’re 50 and older can add more years to your life?

According to a new research conducted by Harvard University scientists,adults who follow five healthy habits which include never smoking,maintaining a body mass index(BMI)(体重指数)below 30,exercising for at least 30 minutes a day,drinking alcohol only reasonably,and following a well-balanced diet,can add a decade or more to their lifespan.

The study,published in the American Heart Association’s journal Circulation,suggests that men over age 50 who follow these five lifestyle habits can add up to 12 years to their lives while women who follow these healthy habits can add 14 years to their lifespan. While the method of living a longer and healthier life hasn’t changed much over the years,this new information regarding the benefits of working out and eating healthily later in life is a bit of a breakthrough in terms of how we look at aging.

Modern medicine often treats the elderly with a more reactive approach,focusing on discovering and creating medicines and therapies to combat(防止)life-threatening illnesses like cancer and especially heart disease. According to scientists who conducted this study,the focus should be on preventative(预防的)measures,making sure aging adults are adapting healthy habits before they reach a stage in life when health issues normally arise.

It is very important to put prevention through diet and lifestyle changes first. Heart disease and cancer are the leading causes of death in the United States,while heart disease in particular can arise because of certain lifestyle habits. One of those habits is smoking,which scientists said was the biggest determining factor in a person’s lifespan. Researchers found that there was a direct connection between an adult’s risk of early death and his lifestyle habits,with those following all five of the healthy habits enjoying significantly longer lives.

【小题1】What is the question in the first paragraph intended to do?
A.To provide some advice for readers.
B.To predict the following paragraphs.
C.To introduce the topic of discussion.
D.To offer some background information.
【小题2】What is the most important in fighting against life-threatening illnesses?
A.Developing new therapies.
B.Discovering new medicines.
C.Applying effective prevention.
D.Following a well-balanced diet.
【小题3】Which of the following is the biggest threat to a person’s lifespan?
A.Smoking.B.Lack of exercise.
C.Drinking heavily.D.Unbalanced diets.
【小题4】What is the text mainly talking about?
A.A healthy lifestyle determines humans’health.
B.Healthy lifestyles help the older lengthen their lifespan.
C.How to live a healthy lifestyle.
D.Bad lifestyles increase people’s risk of early death.

同类题5

   A newly-published study has shown that loneliness can spread from one person to another,like a disease. Researchers used information from the Framingham Heart Study,which began in 1948. The Framingham Heart Study gathers information about physical and mental health,personal behavior and diet. At first,the study involved(使参加)about 5,000 people in the American state of Massachusetts. Now more than 12,000 individuals(个人)are taking part.

Information from the Framingham Heart Study showed earlier that happiness can spread from person to person. So can behavior like littering and the ability to stop smoking.

Psychologist John Cacioppo,at the University of Chicago,led the recent study. He and other researchers tried to show how often people felt lonely. They found that the feeling of loneliness spread through social groups.

Having a social connection with a lonely person increased the chances that another individual would feel lonely. In fact,a friend of a lonely person was 52% more likely to develop feelings of loneliness. A friend of that person was 25%more likely. The researchers said this shows that a person could indirectly be affected by someone’s loneliness.

The effect was the strongest among friends. Neighbors were the second most affected group. The effect was weaker on husbands and wives,and brothers and sisters. The researchers also found that loneliness spread more easily among women than men.

The New York Times newspaper reported that,on average,people experience feelings of loneliness about 48 days a year. It also found that every additional(额外的)friend can decrease loneliness by about five percent,or two and a half fewer lonely days.

Loneliness has been linked to health problems like depression(抑郁症)and sleeping difficulties. The researchers believe that knowing the causes of loneliness could help reduce it.

The study suggested that people can take steps to stop the spread of loneliness. They can do this by helping individuals they know who may be experiencing loneliness. The result can be helpful to the whole social group.

【小题1】As for the Framingham Heart Study we can learn that __________.
A.it was only conducted in 1948B.it involves more than 12, 000 people
C.it was founded by John CacioppoD.it showed that any behavior could spread
【小题2】From the passage, we can learn that __________.
A.the behavior of littering doesn’t spread
B.a lonely person won’t have friends
C.everyone may be affected by others’ loneliness
D.lonely people don’t know the causes of their loneliness
【小题3】Which statement about the spread of loneliness is TRUE?
A.The spreading effect is the second strongest among friends.
B.No spreading effect is found on husbands and wives.
C.Women are more likely to be affected than men.
D.Brothers are more easily to be affected than neighbors.
【小题4】What is the main idea of the passage?
A.Action should be taken to help lonely people.B.People feel lonely for many reasons.
C.Ways to fight against loneliness.D.Lonely people can affect others.