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【单选题】
我国北方在早春播种后,塑料薄膜覆盖地面(俗称地膜覆盖)的方法来促进提早出苗,原因是(  )
A.
种子萌发需要避光
B.
防止虫害破坏
C.
保温、保湿,有利萌发
D.
防止风沙
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A.
保护电路
B.
过载保护
C.
欠电压保护
D.
短路保护
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A.
Tom must have an absolute advantage in the production of baseball bats.
B.
Jim must have an absolute advantage in the production of baseball bats.
C.
Tom has a comparative advantage in the production of baseball bats.
D.
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A.
Both are ball games.
B.
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C.
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D.
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A.
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A.
not in order to
B.
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C.
in order to not
D.
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A.
永恒不变
B.
瞬息万变
C.
永远存在
D.
特指千秋万代
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