To estimate the expansion rate of the universe is a notoriously difficult problem because there is a lack of a single yardstick that all distances can be measured by.
To estimate the expansion rate of the universe is a notoriously difficult problem because there is a lack of a single yardstick that all distances can be measured by.
Estimating the expansion rate of the universe is a notoriously difficult problem because there is no single yardstick by which all distances can be measured.
Because there is a lack of a single yardstick to measure all distances by, estimating the expansion rate of the universe is a notoriously difficult problem.
A notoriously difficult problem is to estimate the expansion rate of the universe because a single yardstick is lacking by which all distances can be measured.
It is a notoriously difficult problem to estimate the expansion rate of the universe because by no single yardstick can all distances be measured.
题目分析:此题存在一个因果联系。即“因为没有标尺,所以估计宇宙的膨胀速度是个难题”。
选项分析:
A选项:because之后跟着一个there be句型,其核心成分为“there is a lack”,即“这里有一个缺少”。但直接导致“估计速度是个难题的”应该是“没有标尺”这件事,而不仅仅是“这里有个缺少”。
B选项:正确。because之后的核心成分为“there is no yardstick”,即“这里无标尺”。
C选项:there is a lack错误同A。
D选项:此选项的字面意思为“因为标尺正在缺少,所以难题 是 预估速度这件事”。很明显,“正在缺少”这一进行时是不合理的,且“标尺缺少”导致的应该是“ 预估速度这件事 是 难题”,而不是“难题 是 预估速度这件事”。
E选项:主句中,it作形式主语,指代“预估速度”这件事。原因状语从句中,是一个倒装,还原一下为“all distances can be measured by no single yardstick.” 其字面意思为“所有的距离可以被 没有任何一个标尺 测量 ”。那么整句话的核心意思为“因为被测量,所以是难题”。但合理的应该是“因为没标尺,所以是难题”。
D 选项:“标尺缺少”导致的应该是“ 预估速度这件事 是 难题”,而不是“难题 是 预估速度这件事”。
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