科研之友
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<正>Have you ever felt sick to your stomach during a test? Have you had days when you were so loaded1 down with homework that you had trouble sleeping? Have you ever been so worried about something that you ended up with a terrible headache?你在考试期间是否曾感到肠胃不适?你是否曾有几天因为繁多的家庭作业而无法入睡?你是否曾经因为担心某事而头痛不已?
