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题库 / OG2019-SC-691
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”。
还是不太能理解E选项的解析，想请问如果我想用e的倒装方法去强调没有标尺的话，这句话要怎么说呢？
because all distances can be measured by no single yardstick.
这里没有衡量标准在because里做状语，但它是导致不能评估宇宙的扩展速度的直接原因，应该做because的主语。
让no single yardstick 做主语，再把句子倒装就可以了。
相同的疑惑...我感觉E逻辑和语法上都没啥错误...
可能把all 改成any就可以了吧
用E的倒装方法去强调没有标尺的话，要改成: It is a notoriously difficult problem to estimate the expansion rate of the universe because no single yardstick can be used to measure all distances. =To estimate the expansion rate of the universe is a notoriously difficult problem because…….
E既不是倒装错了，也不是all错了，它是成分用得不对。no single yardstick 是造成它困难的原因，应该作句子的主要成分（主语或宾语），B把它用作原因状语从句的宾语，E 把它用作原因状语从句的状语，处于从句的第二层，类似于把一个重要的元素藏在一个句子的小角落，不便于说话者达意，也不便于听者/读者理解。
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