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问题 单项选择题

有关水圈的叙述，正确的是：（）

A、水圈的主体是地球上的冰川

B、水是地球表面分布最少的物质

C、水很少参与地理环境物质能量转化

D、水几乎伴随一切自然地理过程

答案

参考答案：D

单项选择题

TH1细胞分泌（）。

A.IFN-γ

B.IL-4

C.IL-5

D.IL-6

E.IL-10
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单项选择题

Which of the following explanations regarding the high number of Caesarean operations is NOT true

A．Some mothers have passed the best age for a natural delivery.

B．Some mothers have fertility problems.

C．Some mothers favor the operations of this type.

D．Some mothers have had surgical operations on their fallopian tubes.
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