In 1914 a total of 469,000 cars and trucks were produced in the United States, but in 1929 almost twice the numbers of trucks alone came off the assembly lines.
the numbers of trucks alone
that number of trucks alone
the number of trucks by themselves
as many trucks themselves
as many trucks by themselves
So:
Two trucks came off the assembly line.
Twice as many trucks came off the assembly line.
Three times the previous number of trucks came off the assembly line.
Etc.
choice (b) conveys this idea accurately, with the phrase "twice that number". see, "that number" must refer to an actual number cited in the sentence, and there is only one such number. mission accomplished.
"trucks themselves" doesn't make sense.
you don't use "x itself" unless you are trying to emphasize some element of the inherent nature of x (as opposed to something associated with x, or with some part of x).
example: pet accessories are becoming more and more popular, even though pets themselves have maintained constant popularity.
choice (d) DOES NOT convey this idea. that choice says "twice AS MANY trucks", which means "twice as many trucks as were produced in 1914".
the problem is that the sentence doesn't tell us how many trucks were produced in 1914
同问。核心词是number直接排了ABC,so tricky...
发出came off的是trucksthe\that number of Xs 并不是通常意义上的A of B的结构,它的核心词是X,the\that number of Xs 和 two Xs、a number of Xs、twice as many Xs 一样,核心词都是X
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this sentence contains no information about the previous number of trucks; there's only a combined figure for trucks and cars. so, that doesn't work.
不能选DE, 是因为从前文推不出来Truck有多少量,所以何来Twice as many
as many as是个固定搭配,D少了后面那个as
用as many trucks时,整个句子的意思是“1914年汽车和卡车一共生产了469,000辆,而1929年两倍的卡车下了生产线”,句子前后并没有直接逻辑联系,前面句子并没有讲卡车有多少辆登录 或 注册 后可以参加讨论