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GWD-27-Q7 Providing initial evidence that airports are a larger source of pollution than they were once believed to be, environmentalists in Chicago report that the total amount of pullutant emitted annually by vehicles at O'Hare International Airport is twice that emitted annually by all motor vehicles in the Chicago metropolitan area.
Prep08题后的解释说twice后可以直接加名词,这与Prep08-181题后的解释补充的曼哈顿解释矛盾吗?——曼哈顿解释:twice后如果不是表示数的词,就要用as many/much as,如 twice the water 就是不对的。那请问上面那道题里的twice that中that指代的是什么?是前面的the amount吗?如果是twice the pollutant,那么究竟对还是不对?同时请教一下,这种the amount of+名词或者percent of+名词的结构,核心词是数还是后面的名词,代词一般指代哪一个?这个疑惑主要表现在这道题中:
Prep08-181后补充题:
According to surveys by the National Institue on Drug Abuse, about 20 percent of young adults used cocaine in 1979, doubling those reported in the 1977 survey.
A.原句
D.twice as much as those reported in the 1977 survey
E.twice the number reported in the 1977 survey
答案给的是E,可以理解。 但不明白为何 A项的错误在哪,是不是因为those指代不明。另外,C项中如果much改成many,即变成 twice as many as those reported in the 1977survey,这样对吗?这里就涉及到了上文提到的twice或者double后面所跟的词究竟是指代percent/amount,还是代指后面的核心名词?
望高手给予解答!谢谢!小弟在比较结构和倍数表达方面尤其犯晕,还请高手指点!
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