第3题: [单项选择]督脉的主要生理功能是 A. 总督一身之阴经 B. 总督一身之阳经 C. 分立一身左右之阴阳 D. 约束诸经 E. 凋节十二经气血 参考答案:B
第4题: [单项选择]In the midst "of utter devastation and chaos, a father left his wife safely at home and rushed to the school where his son was supposed to be, only()that the building was as fiat as a pancake. A. to discover B. to be discovered C. discovering D. discovered 参考答案:A
A. could have helped B. must help C. should have helped D. ought to help 参考答案:C 答案解析:[分析] should have done sth.意为:本应该做某事(但却没有做),这句话的意思是“尽管你很忙,但是你(本)应该帮助他摆脱困境。”