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【题目】There's no snake that will habitually(习惯性地)attack humans__________ it is in danger.

A.unlessB.ifC.thoughD.since

【答案】A

【解析】

句意:没有蛇会习惯性地攻击人类,除非它处于险境。

考查连词。A. unless除非;B. if如果;C. though虽然;D. since因为、既然。由于前半句句意是否定的,所以后半句应是否定意义的连词引导,整个句意才通顺,故选A

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