1. Why is the existence of many species of animals and plants important for humans?

Because many species take part in natural processes which guarantee that ecosystems work well and keep giving us food, fibres and fuel.

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

False. Ecosystems are different and this percentage is just a reference set up by scientists. And things don't go wrong immediately, according to Professor Andy Purvis.

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

About 71% of the global population live in 58% of the world's land cover.

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

Professor Purvis wants to convey the idea that human societies take a great risk in a deadly game.

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

Recession.

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 biodiversity.

2. Birds and starfish live in different ecosystems.

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

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