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问题 问答题 简答题

神经组织的主要特征及最主要的机能是什么？

答案

参考答案：由神经细胞或称神经元和神经胶质细胞组成。神经胶质细胞无传导兴奋的能力，但有支持、保护、营养和修补等作用。

单项选择题 案例分析题

地—气系统（大气和地面）吸收太阳短波辐射（能量收入），又向外发射长波辐射（能量支出），能量收支的差值，称为辐射差额。下图示意沿海某地多年平均辐射差额的月份分配。读图结合材料完成第下列小题。

若只考虑辐射差额对气温的影响，该地气温最低的月份是（）

A.1月

B.4月

C.8月

D.12月
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单项选择题

Government bans on the dumping of sludge anywhere in the ocean are based on the belief that the spread of sludge by ocean currents poses a danger to people. Since it is not clear that sludge dumped on the ocean bottom, far from coasts, would endanger people, the bans should be revised to apply only to coastal waters.
Each of the following, if true, supports the conclusion that the bans on ocean dumping should be revised EXCEPT:

A．The slow-moving water near the ocean bottom mixes so slowly with water closer to the surface that sludge dumped on the ocean bottom would be decomposed by bacteria before currents could bring it to the surface.

B．Many locations on the ocean bottom far from coasts are geologically stable, and unlikely to be disrupted by earthquakes or volcanic eruptions.

C．Deep-sea marine plants and animals in the human food chain live at depths far above the ocean bottom.

D．Dumping large amounts of sludge would have an unknown effect on organisms that live on the ocean bottom.

E．(E) The technology exists to lower sewage sludge to oceanbottom dump sites without contaminating waters closer to the surface.
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