题干

说明生物群落在垂直方向上具有分层现象的是(  )

A:森林中有乔木层,灌木层,草木层和地被物层

B:一片竹林中的竹子高矮不一

C:森林中的树木的间隙有较多的灌木和草丛

D:鹿群中有的鹿高,有的鹿矮

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答案(点此获取答案解析)

A

同类题1

阅读下面材料,在空白处填入一个适当的单词或括号内单词的正确形式。(提示;每空不超过三个单词)

    Each different part of China has its own special forms of traditional art. These usually try to show the things____are important in life, such as love, beauty and family. The most common things, from paper to clay to bamboo, are turned into objects of beauty.

    According to Chinese history, sky lanterns were first used by Zhuge Kongming. He sent them out ____(ask)for help when in trouble. Today, sky lanterns are used at festivals and other celebrations. They____(make) of bamboo and covered with paper. When the lanterns are lit, they slowly rise into the air like small hot-air balloons for all to see. They are seen as bright symbols of____ (happy) and good wishes.

    Paper cutting____(be)around for over 1500 years. Paper cutting sounds very easy____it can be difficult to do. The paper, usually red, is folded before it is cut with scissors. The Most common pictures are flowers, animals, and things about Chinese history. During the Spring Festival, they are put on windows, doors and walls____symbols of wishes for good luck and a happy new year.

    Chinese clay art is famous because the clay pieces are so small but they look very real. The pieces are usually cute children or lively characters from a Chinese fairy tale or historical story. The pieces are____(careful)shaped by hand from a very special kind of clay and then allowed to air-dry. After____(dry) they are fired at a very high heat. They are then polished and painted. It takes several weeks____(complete)everything. These small pieces of clay art show the love that all Chinese people have for life and beauty.

同类题2

任务型阅读

    Traveling for business or pleasure can easily damage your health. It's easy to fail into the trap of high caloric meals and little exercise.____

    Keep a dictionary on hand

    If you are traveling somewhere with a different language, pack a dictionary and keep it close to help you negotiate(商议)the menu and make healthy food choices.____Look up the words that you don't understand to help you learn about cooking methods and ingredients(材料)so that you can choose healthy food.

    ____

    The more you can research before your trip, the easier it will be to keep a healthy lifestyle while traveling. To stay on track with your food, try to find a nearby grocery store or healthy food store, look up a couple of well rated restaurants that offer some healthy choices, and try to stay somewhere with a fridge or kitchen.

    Walk every day.

    Exploring your destination(目的地)on foot is an amazing way to take some exercise while traveling. Walk through the nature to enjoy its beautiful scenery, listen to the sound of nature and take some wonderful pictures.____

    Rent a bike.

    Cover more ground while burning calories by renting a bike. Many major cities have bike-sharing programs, or you could contact a local bike store to ask about bike rentals.____If you have an open schedule, you could even research bike tours, which are a great way to cover a long distance in a short period of time.

A. Avoid junk food and deep fried food.

B. Research the food and store some upon arrival.

C. Take a bike map of the city, research day trips and get exploring.

D. If you are exercising while traveling, make sure to take in extra water.

E. Here are some healthy travel tips which will keep you in good health.

F. You can't avoid deep fried food if you don't know that they're in there!

G. This is also a great way to find hidden attractions that aren't in the travel guides.