2. 外语
  3. For three-quarters of its span on Earth, life evolved almost ______ as micro-organisms.

For three-quarters of its span on Earth, life evolved almost ______ as micro-organisms.

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问题 For three-quarters of its span on Earth, life evolved almost ______ as micro-organisms.
选项 A、precisely
B、instantly
C、initially
D、exclusively
答案D
解析 由three-quarters和almost可知，生命在进化过程中，有四分之三的时间几乎都以单一的形式存在。exclusively表示“排外地，专有地”，符合句子语境，故D正确。precisely表示“精确地，正好”；instantly表示“立即地，即刻地”；initially表示“最初，开头”。
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