单选题As much is known about what occurs during sleep, the precise function of sleep and its different stages remains largely in the realm of assumption.A Because B Since C For D While
题目
单选题
As much is known about what occurs during sleep, the precise function of sleep and its different stages remains largely in the realm of assumption.
A
Because
B
Since
C
For
D
While
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参考答案和解析
正确答案：
C
解析：
尽管对有关睡眠过程中会发生的情况知之不少，但对睡眠及其不同阶段的确切作用在很大程度上仍在猜想。该题考查句子之间的逻辑关系。从该句前后两个分句中的much is known(知之甚多)和remains in the realm of assumption(属猜想)看，这两个表达形成明显对比，构成转折关系。因此[D]while符合题意，为正确答案。
尽管对有关睡眠过程中会发生的情况知之不少，但对睡眠及其不同阶段的确切作用在很大程度上仍在猜想。该题考查句子之间的逻辑关系。从该句前后两个分句中的much is known(知之甚多)和remains in the realm of assumption(属猜想)看，这两个表达形成明显对比，构成转折关系。因此[D]while符合题意，为正确答案。