A．They live close together．

　　B．Their population is dropping.

　　C．Thev live in distributed areas．D．Their population is increasing fast.

　　35．What can be inferred from the last paragraph?

　　A．There are 29 Amazon tribes in total．

　　B．More isolated tribes are yet to be discovered．

　　C．It's easy for scientists to find isolated villages．

　　D．Isolated villages are distant from rivers and roads．

　　第二节(共5小题；每小题2分，满分10分)

　　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选项。

　　A new report says plastics are responsible for ＄13 billion in damage to the oceans and the undersea environment．The findings were announced recently at a United Nations conference．

　　36

　　Plastic thrown away carelessly makes its way into rivers and other waterways．

　　37

　　After a while，it collects in the sea．And plastic never goes away．Plastic is not biodegradable—destroyed by bacteria or natural processes．Instead，it just breaks up into smaller pieces over time．The oceans contain a lot of chemicals and other pollutants．

　　38

　　That means harmful material may get into our food supply．

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