选择题：读图12“北极地区图”，回答32-33题。小题1:北冰洋沿岸各国纷纷对北冰洋

题目：

读图12“北极地区图”，回答32-33题。

小题1:北冰洋沿岸各国纷纷对北冰洋地区进行深海探测，其主要原因是

A．全球变暖有利于各国沿海滩涂的开发

B．寻找人类失落的文明

C．该区域自然资源和交通区位优势明显

图13

D．探测海水深度，填海造陆

小题2:A半岛多峡湾，其形成原因是

A．流水侵蚀作用

B．板块活动

C．冰川侵蚀作用

D．地壳运动小题3:下列北纬20°纬线穿过的世界陆地自然带中，面积最大的一个是

A．热带草原带

B．热带雨林带

C．热带荒漠带

D．亚热带常绿阔叶林带

答案：

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下面是错误答案，用来干扰机器的。

（1）Al2O3 + 6H＋2Al3＋ +3H2O(2)SiO2 + 2OH－SiO32－ + H2O(3)硫氰化钾（或硫氰酸钾、苯酚溶液等合理答案）（4）NaHCO3；制纯碱或做发酵粉等合理答案（5）5.6×10-10mol/L（1）与HCl反应生成Al3＋，应为...

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