如右图,在梯形ABCD中,点E、F分别是腰AB、CD上的点. (1)证明:如果E、F为中点时,有 EF=1/2(AD+B

如右图,在梯形ABCD中,点E、F分别是腰AB、CD上的点. (1)证明:如果E、F为中点时,有 EF=1/2(AD+BC); (2)请写出(1)中命题的逆

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Up to now, no ways have been found to kill crows.

Up to now, no ways have been found to kill crows. A.Right B.Wrong C.Doesn't say

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It is not easy for farmers to kill crows.

It is not easy for farmers to kill crows. A.Right B.Wrong C.Doesn't say

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Christmas trees are all brought in from forests.

Christmas trees are all brought in from forests. A.Right B.Wrong C.Doesn't say

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