2. 外语
  3. Some well-known scientists believe that there is not enough oxygen on Mars to ______ human life.

Some well-known scientists believe that there is not enough oxygen on Mars to ______ human life.

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问题 Some well-known scientists believe that there is not enough oxygen on Mars to ______ human life.
选项 A、remain
B、sustain
C、retain
D、last
答案B
解析 动词词义辨析题。remain表示“保持，逗留，剩余，残存”；sustain表示“支撑，维持”；retain表示“保持，保留”；last表示“持续”。氧气是维持人类生存用的，B正确。
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