如右图，甲、乙、丙、丁四个长方形拼成正方形EFGH，中间阴影为正方形。已知，甲、乙、丙、丁四个长方形面积的和是32cm2四边形ABCD的面积是20cm2问甲、乙、丙、丁四个长方形周长的总和是()。
A. 32cm
B. 56cm
C. 48cm
D. 68cm
查看答案
A．theseB．eveningC．completeD．planet
A. these
B. evening
C. complete
D. planet
如图所示，矩形ABCD的面积为1，E、F、G、H分别为四条边的中点，FI的长度是IE的两倍，问阴影部分的面积为多少？()
A. 1/3
B. 1/4
C. 5/16
D. 7/24
What happened to the oysters which were taken from the sea to the laboratory？
A. They kept their cycles of activity.
B. They opened and closed their shells at exactly the same time as before.
C. They opened and closed their shells at different times.
D. They didn't open their shells at all.
A．fishB．knifeC．ofD．off
A. fish
B. knife
C. of
D. off
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