题目内容：

1.He was only in ----at the time?
A.his 20's B.the 20's C.his twenties D.the twenties
2.------of the popuiation here are peasants.
A.20 percents B.the 20 percent C.20 percent

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在某某年代（这十年里）：in the 1980sin one's XXs是固定词组,意思是在一个人多大的时候.那个时候他才20多岁吗?选A.percent百分之一[C]Thirty percent of the farmland has been planted to oil crops.百分之三十的...