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题库 / Prep2008E2-SC-222
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
请看讲解视频
B选项that number指代469,000，而D和E的as many trucks 指卡车的数量，原文没有说卡车有多少个。
by themselves" conveys the idea that the trucks came off the assembly line automatically by themselves
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