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问题 单项选择题

支气管哮喘急性发作的肺功能异常主要表现为（）

A.最大通气量增加

B.第一秒钟用力呼气容积减少

C.肺活量减少

D.弥散量下降

E.功能残气减少

答案

参考答案：B

问答题 简答题

滑动摩擦可分为哪几类？
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选择题

.It was the boy, rather than his brothers, that _________ for what they had done.

A．were to blame

B．were to be blamed

C．was to blame

D．was to be blamed
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