【单选题】【消耗次数：1】
6.The old lady fainted on the street and found herself in the first aid room when she came_________.
①
across
②
over
③
in
④
to
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相关题目
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She found herself____ forward more eagerly to the holiday
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looking
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bringing
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desiring
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expecting
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When we came back, he found his bicycle ____
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was stolen
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is stolen
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4. When she entered the dark room, she ____ felt in danger.
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politically
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12. When we arrived, we found the meeting room crowded with ____ students.
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quite a few
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When he came to,he found himself________on a chair,with his hands________back.
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to sit;tying
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sitting;tying
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When he came back after an absence of 20 years, he found his hometown completely ____. ?
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随机题目
【单选题】
短时间的一连串最大刺激作用于肌肉，当相继两次刺激间的时距小于绝对不应期，后一刺激则出现（）
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一连串单收缩
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一次单收缩
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无收缩反应
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关于骨骼肌收缩机制，下述错误的是（）
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引起兴奋－收缩耦联的离子是Ca<sup>2+</sup>；
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细肌丝向粗肌丝滑行；
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横桥与肌纤蛋白结合；
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血浆pH值主要取决于（）
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KHCO<sub>3</sub> /H<sub>2</sub> CO<sub>3</sub> 缓冲对
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K<sub>2</sub> HPO<sub>3</sub> /KH<sub>2</sub> PO<sub>3</sub> 缓冲对
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