What keeps Grimsvoto still？
A. The slow flow of water．
B. The low water temperature．
C. The thick glacier．
D. The water pressure．
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It takes more energy to do a job in two minutes than__________ the same job in two hours．
A. to do
B. do
C. will do
D. is doing
为了保证培训取得预期的效果，必须对培训进行（）监控和评估。
A. 重点
B. 全程
C. 针对性
D. 参与性
波导等效为双线的等效条件是什么？为什么要引入归一化阻抗的概念？
Many doctors don'tbelieve that music can treat diseases because
A. recover from disease quickiy
B. there is not minds actively
C. use their minds actively
D. it improves general well-being
E. listen to musical performances
F. it brings many other benefits
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