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问题 单项选择题

婴儿生后2～3个月时红细胞数降至3.0×1012/L,血红蛋白量降至110g/L是

A．极重度贫血

B．中度贫血

C．生理性贫血

D．重度贫血

E．轻度贫血

答案

参考答案：C

选择题

Lucy ________ guitar lessons every three weeks in the past three years, but now she is considering she'll make it every other week.

A．is having　

B．had had

C．had　

D．has been having
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单项选择题

当通气储备百分比为多少时出现气急（）

A.95%

B.90%

C.85%

D.75%

E.65%
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