Deserts . Small green plants are very important to dry places because.

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问题 Deserts ______.
Small green plants are very important to dry places because______.

选项 A、they don’t let the sun make the earth even drier
B、they don’t let the wind blow the earth away
C、they hold water
D、all of the above

答案D

解析本题要解释为什么绿色植物对沙漠来说很重要，第二段后半部分作了解释，即有助于制止太阳吸收更多水分，防止大风刮走表层土，下雨时起蓄水作用。以上就是A、B、C三项所述内容，故D为正确答案。

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