2. 外语
  3. Some paleontologists debate whether the diversity of species has (i)______ since the Cambrian period, or whether imperfections i

Some paleontologists debate whether the diversity of species has (i)______ since the Cambrian period, or whether imperfections i

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问题 Some paleontologists debate whether the diversity of species has (i)______ since the Cambrian period, or whether imperfections in the fossil record only suggest greater diversity today, while in actuality there has been either (ii)______ or decreased diversity.
选项 A、changed…escalation
B、increased…stasis
C、expanded…discontinuity
D、declined…reduction
E、improved…deviation
答案B
解析 空格(ii)：
- 方程等号：either A or B，A与B反义重复，
- 强词和对应：根据题意，空格(ii)和decreased构成反义重复，体现物种多样性“不下降”，即“上升”或者“不升不降”。escalation增加，stasis停滞，discontinuity不连续，reduction降低，deviation偏离。选项A和B合适。
空格(i)：
- 方程等号：whether A or whether B，A与B反义重复。
- 强词和对应：空格(i)和greater构成反义重复。change改变(可能“变多”也可能“变少”，排除)，increase增加(对)，expand扩展(对)，decline下降(错)，improve增加(对)。答案选B，在这里increase和greater是程度差异，正确。
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