A. they were deeply moved by her spirit B. they wanted to get her help in their studies C. she was good at telling funny stories D. she had got an excellent result in the exam 参考答案:A 答案解析:从本文最后一段最后一句话可以看出,因为 Mrs.Hanson向同学自我介绍并述说自己的目标后,同学们被她的刻苦学习精神所感动。
第20题: [单项选择]发生共振现象要求供应者和接受者哪种参数一致() A. 形状 B. 重量 C. 体积 D. 频率 E. 密度 参考答案:D 答案解析:发生共振现象要求供应者和接受者频率一致,磁共振是一种生物磁自旋成像技术,核磁共振成像的"核"指的是氢原子核,因为人体的约70%是由水组成的,MRI即依赖水中氢原子。利用人体中的遍布全身的氢原子在外加的