2. 职称英语
  3. As much is known about what occurs during sleep, the precise function of sleep a

As much is known about what occurs during sleep, the precise function of sleep a

游客2025-01-28  37
问题 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.
选项 A、Because
B、Since
C、For
D、While
答案 D
解析 句意：尽管对睡眠过程中会发生的情况知之甚多，但对睡眠及其不同阶段的确切作用在很大程度上仍属猜想。该题考查句子之间的逻辑关系。根据much is known(知之甚多)和remains in the realm of assumption(属猜想)可知，前后分句构成转折关系。所以答案为D。
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