The survey showed that_____numbers of 15-year-olds had already smoked twenty cig

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问题 The survey showed that_____numbers of 15-year-olds had already smoked twenty cigarettes a week.

选项 A、essential
B、steady
C、primary
D、substantial

答案 D

解析各项的意思是：essential“本质的”；steady“稳定的”；primary“主要的，初步的”；substantial“大体上，基本上，实质的，坚固的”。空格处的意思是：调查显示，相当数量的15岁的孩子一周已经要吸20支香烟。

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