C．the worsening climate change

　　D．killing off wild creatures and plants

　　答案：C　细节理解题。根据文章第四段最后一句“The trouble is that in coming decades, the additional threat of worsening climate change will become more and more common and could then kill of these survivors”可知，不断恶化的气候变化是一个未来威胁。故答案为C。

　　7．What does “This” in the last sentence refer to?

　　A．mass extinction

　　B．extinction rates

　　C．extinction time

　　D．75% of species or more

　　答案：A　代词指代题。根据文章最后一段可知，This指的是上句中的“a mass extinction—which is defined as one involving a loss of 75% of species or more”， mass extinction意思是“大量消亡，大灭绝”。故答案为A。

　　Ⅱ.七选五

　　根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余项。

　　3－2－1 GREEN!

　　You already know an environmentalist's three R's: reduce, reuse, recycle. __1__ Here are three things you can do for the Earth Day.

　　Be a real cut­up

　　The next time you're about to throw out the plastic rings that hold a six­pack of soda together, reach for a pair of scissors.

　　As a young turtle, Peanut got stuck in one of those rings. As she grew, the ring stayed put(原地不动), forcing her shell to grow around it. By the time someone found her and cut her free, her shell was permanently deformed(成畸形的). Thanks to her hard shell, Peanut is alive and well. She now lives at a nature center in Missouri. But most animals that get caught in six­pack rings die.

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