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问题 选择题
向一定体积的Ba（OH）2溶液中逐滴加入稀硫酸，溶液的导电性（以电流I表示）滴入的稀硫酸的体积（用V表示）间的关系最接近真实情况的是（   ）

A．

B．

C．

D．

答案

答案：A

单项选择题

John was given the same suitcase his father and grandfather（）with them to school.

A. took

B. had taken

C. were taking

D. would take
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单项选择题

肺心病肺部原发病常见表现是( )

A．肺动脉瓣区第二心音亢进

B．长期慢性咳嗽

C．剑突下心尖搏动

D．右心室肥大

E．右心房肥大
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