2. True or false? If 10% of the species in any ecosystem disappear, everything will go badly wrong there.

3. How much of the Earth's land cover houses almost three-quarters of the world's population?

4. What idea does Professor Purvis want to convey when using the expression 'ecological roulette'?

5. Which noun is often used to refer to a period in which trade and industrial activity are reduced?

2.  请你在不参考课文的情况下完成下列练习。选择一个意思合适的单词填入句子的空格处 。

1. The more species you have in a particular area, the greater is its __________.

pollination      biodiversity      framework      savannas

2. Birds and starfish live in different __________.

biodiversity      boundaries      ecosystems      societies

3. If tropical forests are not preserved, many species of animals might end up __________.

interconnected      safe      playing ecological roulette      extinct

4. An ecosystem is everything that exists in a particular __________.

society      environment      biodiversity      ecology

5. It's necessary to avoid further loss of biodiversity or the __________ will be devastating.

boundaries      consequences      environment      land surface

答案 1.  阅读课文并回答问题。

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