Keep away from these computer games.They're ________ to teenagers.
A. hopeful B. useful C. harmful
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It is reported that the food that Chinese people ________every year is enough to feed 200 million people for a year.
A. waste B. have C. make
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—________ Mike ________ his brother always rides a bike to work instead of driving a car.
—They think it's good for their health and the environment.
A. Either；or B. Neither；nor C. Not only；but also
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This city develops very fast.Workers ________ many buildings in the last five years.
A. have attended B. have built C. have prevented
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Something must ________to protect the sharks because many of them are endangered now.
A. do B. done C. be done
难度: 中等查看答案及解析
Last week，Chicago became the first city in the US to join the “Lights Out Plan”．People turned off the lights in the city's tallest buildings so that thousands of birds could get to their winter homes.Every year in autumn，some birds fly over Chicago on their way to the south and come back the next spring.
Lights mean danger to birds.Birds find their way by looking at the stars in the sky.Lights in tall buildings are so bright that birds may mistake them as stars.This means they can not find the right way to go home.
This month，about 300 types of birds are flying over Chicago to go back to the south to live through the cold winter.
Birds fly to warmer places for a few reasons.Many birds cannot live in the cold，so they fly to warmer places.But there are other reasons，too.Birds need to look for food in the south.Another reason is that they want to have baby birds.Many birds like to have their baby birds in the same “house” they lived in last year，so they fly back there.
There are about 9，000 kinds of birds in the world，and about 600 kinds of birds migrate．Some birds can fly a very long way.Sometimes they fly to other countries.We have fewer birds today because there are fewer places for birds.
1.Why did people in Chicago turn off the lights in the city's tallest buildings last week?
A. Because people wanted to save money.
B. Because people were afraid that birds would lose their way.
C. Because people were afraid that birds would make much noise.
2.What does the underlined word “migrate” mean in Chinese?
A. 迁徙 B. 定居 C. 冬眠
3.Today we have fewer birds because ________.
A. lots of birds are often ill
B. people kill lots of birds
C. there are fewer places for birds
4.Which of the following statements is NOT true?
A. All birds fly to warmer places every year.
B. Some birds have to fly to warmer places in autumn.
C. Some birds can fly a long way to other countries.
难度: 中等查看答案及解析