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问题 单项选择题

隔热效果最好的砌块是（　　）。

A．粉煤灰砌块

B．中型空心砌块

C．混凝土小型空心砌块

D．蒸压加气混凝土砌块

答案

参考答案：D

解析：【解析】蒸压加气混凝土砌块。以钙质或硅质材料，如水泥，石灰、矿渣、粉煤灰等为基本材料，以铝粉为发气剂，经蒸压养护而成，是一种多孔轻质的块状墙体材料，也可作绝热材料。

单项选择题

Imagine fishermen walking down to the seashore, ready to carry out their early morning routine of preparing their boats and net. (51) they hope for a good catch of fish. But to their (52) , a horrible sight meets their still sleepy eyes. Thousands of fish have been washed ashore dead. The cause of this mass destruction—A red tide!

Red tides are a global (53) . They have been observed on both the Atlantic and the Pacific coasts of the United States and Canada. They have also occurred in many other places. Though relatively few people are (54) them, red tides are not new.

In the Philippines, a red tide was first seen in the province of Bataan in 1908. Since then, red tides have been seen in many other (55) . A Philippines red tide expert told us that " (56) the fish kills, the Philippines has documented 1, 926 eases of dead shellfish poisoning caused by red tides. "

The term "red tide" (57) the discoloration of water that sometimes occurs in certain areas of the ocean or sea. Although the color is often red, it may also be (58) of brown or yellow. The World Book Encyclopedia reports that "the discolored areas may range from (59) a few square yards to more than 2,600 square kilometers. "

What causes such discoloration Red tides are generally caused by several species of single-celled organisms. These tiny organisms have hair-like projections which they use to (60) themselves in water.

56().

A. except

B. besides

C. despite

D. without
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单项选择题

烟草专卖行政处罚的管辖是指界定烟草专卖行政主管部门之间、烟草专卖行政主管部门与（）之间实施烟草专卖监督检查以及查处违法案件的具体分工和权限的一种法律制度。

A、工商局

B、公安局、检察院

C、人民法院

D、其他执法机关
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