Tigers are strong and dangerous animals. But now they are in danger. What happened to them? What can we do to save them? In the past, there were eight kinds of tigers in the world. But during the 20th century, only five were left. The number of Siberian tigers was about 300, but now it is less than 22. They’re in danger of dying out. Lots of hunters hunt for them for money. If the government does nothing, we won’t be able to see them in ten to twenty years. The most important thing is that it will lose the balance of the environment. It’s time to do something for our Siberian tigers.
In order to stop people from hunting and killing wild tigers, and in order to make wild tigers more, the World Wildlife Fund has started a program recently. China and twelve other countries joined it. 
However, it’s not enough. Remember that nature is a food chain. If we hurt and kill too many wild deer and pigs, wild tigers will die out because of hunger. So the most important thing is to save the animals that tigers eat. In order to protect the wild tigers, we need to call on more people to stop eating, hunting and killing wild animals. Let’s work together!

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1.During the 20th century, _______ kinds of wild tigers died out.

A 3

B 5

C 8

D 20

解析：选A。数字计算题。根据第一段第五、六句In the past, there were eight kinds of tigers in the world. But during the 20th century, only five were left.可知，故选A。

2.The number of the wild Siberian tigers reduced about _______.

A 5%

B 22%

C 93%

D 30%

解析：选C。数字计算题。根据第一段第七句The number of Siberian tigers was about 300, but now it is less than 22. 可知，西伯利亚虎减少了近280只，相当于减少（300-22）÷300≈93%，故选C。

3.Wild tigers will be in danger of dying out without _______.

A pigs

B deer

C people

D both A and B

解析：选D。细节理解题。根据第三段第三句If we hurt and kill too many wild deer and pigs, wild tigers will die out because of hunger.可知，故选D。

4.Which of the following statements is NOT true?

A There are less than 22 wild Siberian tigers now.

B There are twelve countries in the World Wildlife Fund.

C Wild tigers mainly feed on pigs and deer.

D It’s our duty to protect the wild tigers.

解析：选B。细节理解题。根据第二段内容可知，中国和其他十二个国家参加了这个组织，应该有13个国家，故选B。

5.The passage mainly tells us _______.

A why and how we protect the wild tigers

B the government does everything they could to protect the wild tigers

C the wild tigers will die out in ten to twenty years

D the most important thing is to save the animals that tigers eat

解析：选A。主旨大意题。根据全文尤其是第三段可知，故选A。