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问题 单项选择题

农民适时摘除棉花的顶芽，解除顶端优势，以促进侧芽的发育，从而使它多开花、多结果。顶端优势是下列哪种植物激素作用的结果（）

A.乙烯

B.细胞分裂素

C.脱落酸

D.生长素

答案

参考答案：D

单项选择题

持票人行使追索权，可以请求被迫索人支付（）费用。

A.违约费

B.由此造成的经济损失费

C.被拒绝付款的汇票金额

D.清偿全部金额
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完形填空

用括号内所给单词的适当形式填空。（5分）

1. He shows great interest in _________ (chat) with his classmates by QQ.

2. I prefer _________ (music) who play many different kinds of songs.

3. If I had a million dollars, I’d give it to _________ (medicine) research.

4. John _________ (drop) his wallet on the ground while walking on the road.

5. Please speak ___________ (clear), or others can’t catch what you mean.
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