单项选择题

肺炎患儿鼻前庭给氧时，氧浓度一般不超过A．20％B．30％C．40%D．50％###SXB

A.20％
B．30％
C．40%
D．50％
E．60％

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我国农业的社会主义改造经历了以下哪几个阶段( )。
A．土地改革 B．互助组
C．初级社 D．高级社
E．人民公社

A.土地改革
B.互助组

C.初级社
D.高级社

Which step was NOT included in the immediate actions in the article?
A．Shifted the wet medical equipment to dry place
B．Informed the warehouse Manager of the incident at once
C．Dried the wet equipment with blankets
D．Did some casual mending to the roof

A.Shifted
B.Informed
C.Dried
D.Did