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

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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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