问题
选择题
—Do you know why we must keep a lot of green plants?
—Sure, I do. Green plants can hold water and keep the earth _ . [ ]
A. dry
B. wet
C. warm
答案
答案：B
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—Do you know why we must keep a lot of green plants?
—Sure, I do. Green plants can hold water and keep the earth _ . [ ]
A. dry
B. wet
C. warm
答案：B