purchases affect groups of animals or plants"可知选A项。

　　答案：A

　　2．What kind of contribution do the researchers make?

　　A．To discover the effective measures.

　　B．To invent an advanced machine.

　　C．To give a reasonable explanation.

　　D．To mark the locations of the species threat.

　　解析：细节理解题。根据文章第二段的最后一句"They've used this technique to create a series of world maps that show the species threat hot spots for individual countries"可知选项D符合题意。

　　答案：D

　　3．Which of the following is true about the species threat?

　　A．It has involved all kinds of animals.

　　B．It is caused by global supply chains.

　　C．It firstly started in the USA.

　　D．It went beyond people's expectation.

　　解析：推理判断题。文中并未说明涉及所有动物，排除A项；C项和D项文中没有信息支持。根据文章第二段中的"realize threats to wildlife caused by the world－wide supply chains"可知选项B符合题意。

　　答案：B

　　4．What is the passage mainly discussing about?

　　A．We can afford to buy whatever we need now.

　　B．How we handle the new environmental problems.

　　C．What we buy has an effect on the endangered species.

　　D．How to use modern technology to protect wildlife.

　　解析：主旨大意题。根据文章第一段最后一句中的"however，it can be hard to know just how consumer purchases affect groups of animals or plants-until now"和第三段第一句"The researchers calculated the percentage of threat to an animal or a plant in one country due to consumption of..."可知选C项。

　　答案：C

二、完形填空