2. 外语
  3. The organ transplant community has______humans and monkeys for ethical reasons.

The organ transplant community has______humans and monkeys for ethical reasons.

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问题 The organ transplant community has______humans and monkeys for ethical reasons.
选项 A、knocked out
B、bailed out
C、pointed out
D、ruled out
答案D
解析 句子大意：由于道德原因，器官移植委员会把人类和猿猴——。只有rule out“把……排除在外，排除……的可能性”符合题意。因此本题选D。
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