Smoking is harmful. But as soon as you quit the habit, everything will be OK, right? Wrong.

New research has found that even if you give up smoking, the damage it has done to your genes will stay there for a much longer time. In the research, a team of US scientists studied the blood of 16,000 people. Among them, some were smokers, some used to smoke, and the rest were non-smokers. Scientists compared their genes and found that more than 7,000 genes of smokers had changed--a number that is one-third of known human genes.

According to NBC News, both heart disease and cancer are caused by genetic changes. Some people may have had the changes when they were born, but most people get them in their day-to-day lives while doing things like smoking.

When you stop smoking, a lot of these genes will return to normal within five years.

This means your body is trying to heal (治愈) itself of the harmful effects of smoking. But the changes in some of the genes stay for longer. They can stay for as long as 30 years, It’s almost like leaving a footprint on wet cement (水泥)----it will always be there, even when you’ve walked away and when the cement becomes dry.

Although the study results may make people unhappy, there is a bright side: the findings could help scientists invent medicine to treat genetic damage caused by smoking or find ways to tell which people have heart disease or cancer risks.

【小题1】The function of Paragraph 1 is to_________ .

A．introduce the topic of the passage	B．give an example
C．make an argument	D．show the main idea of the passage

【小题2】Most genetic changes happen because of___________ .

A．people’s condition at birth	B．environmental pollution
C．people’s bad living habit	D．heart disease and cancer

【小题3】The underlined word “it” in Paragraph 5 refers to__________ .

A．the footprint	B．the cement
C．the harmful effect	D．the genetic change

【小题4】Which of the following statements is true?

A．The findings are the fruit of more than three years’ research.

B．The findings have prevented more people from starting smoking

C．The findings offer evidence that a damaged gene can heal itself.

D．The findings help to find cures for genetic damage caused by smoking.

Ladies and gentlemen,
Will you help old when he/she falls down on the street? A recently survey from our class meeting shows that eighty percent of the students think they are sure to help the old because of saving life is more important as anything else. Fifteen percent of the students says whether they help or not depends on the circumstances. However, five percent hold a view which the old shouldn’t be helped. First, they lack the knowledge of first aid, not know how to deal with the situation. Second, they are afraid of getting into trouble.
In my opinion, we should help each others, especially the old people. Please remember “respect the old” is one of our best tradition. Everyone will become old, and if such a case happens to you one day when we’re old, I will say I do need your help.
Thank you.