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Biodiversity(生物多样性), or biological diversity, is a wide-ranging concept that covers all the different kinds of plant and animal species present on earth. Environmentalists believe that many millions of species exist. As all these living organisms are dependent on each other in some way, biodiversity is desirable. Any loss to the planet is actually a loss for mankind as well, and it is our responsibility to try and save Earth’s biodiversity.
Biodiversity has a vital role to play in the evolution（演变）of species. Species become extinct, but new species evolve, and this is how a balance is maintained. This may sound pretty simple, but it takes millions of years for changes to take place.
Biodiversity is also very important to the stability of food webs. Damage to them can mean disaster for an entire ecosystem. The extinction of a single animal species can put huge pressure on the numerous other species dependent on it.
Biodiversity also has an important role to play in human society. Apart from being the most intelligent species on earth, human beings are also the most dependent. We depend on nature to meet our basic needs. When we change the balance of nature to create our cities and bring about our technical advances, we knowing or unknowing cause great damage to the ecosystem. This must be understood, and the damages must be reversed（颠倒）in any way they can to ensure that the balance of the ecosystem is maintained.
【小题1】We learn from the first paragraph that_________.
A biodiversity can be seen
B all living species are found on earth.
C people everywhere are aware of the importance of biodiversity
D the loss of any species can affect humans
【小题2】Why can change in food webs lead to disaster?
A Because it can make people suffer from disease
B Because it can put huge pressure on some species
C Because it takes a long time for such changes to take place
D Because it will damage ninety-nine percent of species
【小题3】What does the underlined word probably mean?
A Immovability B Peace C Strength D Variety
【小题4】We learn from the last paragraph that __________.
A humans are as independent as they are intelligent
B the balance of the ecosystem is easily maintained
C nature has given us a lot
D nature is taking revenge on us
【小题5】Which of the following may be the best title for this passage?
A Food Webs are Closely Related to Biodiversity.
B Biodiversity Plays a Very Important Role in Evolution
C How Biodiversity Affects Human Society.
D Understanding Biodiversity and Its Importance. 查看习题详情和答案>>
句型转换 (10%)
1.It takes me about half an hour to get to school.(改成一般疑问句)
you about half an hour to get to school?
2.The man in the front of the classroom is my English teacher.(对划线部分提问)
English teacher?
3.Daniel plans to go swimming every week.(对划线部分提问)
Daniel to go swimming?
4.How do you celebrate Halloween?. (改为同义句)
__________ celebrate Halloween?
5.We have lots of fun at school. (改为同义句)
We __________ _________ ________ __________ at school.
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【小题1】. It takes hard work to ▲ success.（获得）
【小题2】 A foreigner came up to the counter and asked to be shown some ▲ .（明信片）
【小题3】. My classmate ▲ my rubber and forgot to return it.（借）
【小题4】. Bill Gates is an American ▲ .（公民）
【小题5】. I will not make friends with a ▲ person.（不诚实的）
Welcome to this short tour of London. In this square we are standing in the middle of London. Opposite 对面) is the National Gallery, a museum with lots of famous paintings. Go along the red street to Buckingham Palace. The queen (后) lives here.
Turn left and go to the Houses of Parliament and Big Ben. Opposite you can see the London Eye. It takes you 135 meters above the River Thames. You can see most of London on a clear day.
When you are tired, the best way to see London is by boat. You can get the boat near Big Ben. As you go along the river, the London Eye is on your right, near the Railway Bridge.
Get off the boat at Tower Bridge. Then you can see the Tower of London next to the bridge. The Tower of London is the city’s oldest palace. It is nine hundred years old.
Take the boat back along the river. Get off the boat and go past the station and walk along the street. Opposite is the old fruit and vegetable market. They don’t sell fruit and vegetables now. There are stores and restaurants, and lots of street musicians. Turn left into King’s Street, and go past the church. You’re now back where you started, at the square. Now you finish your tour.
1.If you go to visit the National Gallery, what will you find?
A. lots of lovely animals B. lots of valuable plants
C. lots of famous paintings D. lots of interesting books
2. Where can you get the boat?
A. Near Buckingham Palace. B. Near Big Ben.
C. Near Tower Bridge. D. Near King’s Street.
3. ______ is London’s oldest palace.
A. The Tower of London B. The National Gallery
C. Buckingham Palace D. The Houses of Parliament
4. ______ is the London Eye.
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5.You will not go past ______ on your way back.
A. the station B. the square C. the park D. the church
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