If we __________enough rain last year, w

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问题选择题

If we __________enough rain last year, we___________a good harvest this year. [ ]

A. had had; would have gained

B. had had; would gain

C. had ; would have gained

D. had ; would gain

答案

答案：B

单项选择题

呼吸深慢见于（）。

A.酸中毒

B.情绪激动

C.大量胸腔积液

D.重症肺炎

E.气胸

填空题案例分析题

下列甲图为某反射弧模式图。请据图回答：

乙图结构A中所包含的化学物质是（），通过实验可知乙图结构中含有许多的线粒体D，提供信息传导过程所需的能量，由此可以揭示的生物学观点是（）。