选A.老师第一次问Who would like this ¥100 bill? 时.同学们的反应是:The students began to put up their hands at once. 老师第二次问Who wants it now? 时. 同学们的反应是:The hands went back into the air. 老师第三次问:Who still wants it? 时.同学们的反应是:Hands went back into the air. 很显然.Hands went back into the air 中的back有类似again的含义.故选A. 【
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