正确答案: A

保持水土

题目：云南某地梯田规模巨大，级数最多的达5000级，现已成为中外闻名的观光景点。当初修建梯田的主要目的是

解析：A

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举一反三的答案和解析：

[单选题]I don't understand what the engineer means, but I’ve got rough idea ofProject plan.

不填； the

[单选题]根瘤只见于豆科植物根部。( )

错误

[单选题]CPacing and Pausing

Betty did not take her turn.

[单选题]C Too much TV-watching can harm children’s ability to learn and even reduce their chances of getting a college degree, new studies suggest in the latest effort to examine the effects of television on children.One of the studies looked at nearly 400 northern California third-graders. Those with TVs in their bedrooms scored about eight points lower on math and language arts tests than children without bedrooms TVs.

have watched a lot of TV

[单选题]种柄是由胚柄发育而来的。( )

错误