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问题 选择题

用分子的知识，能解释闻到花香原因的是（　　）

A．分子间有间隔

B．分子有质量

C．分子体积小

D．分子在不断运动

答案

闻到花香是因为构成花香的分子不断运动到人的鼻孔，刺激人的嗅觉细胞使人闻到香味，和分子间有间隔、分子的体积质量小没有直接关系．

故选D．

选择题

The Great Wall is _____ tourist attraction that millions of people pour in every year. [ ]

A. so a known

B. a so known

C. such known

D. such a known

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选择题
He has got used to the school life, _____?

A. hasn't he
B. has he
C. usedn't he
D. didn't he
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