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问题 选择题

It is typical of him to go to bed without washing his feet,

which his roommates can’t _____. 

A．put up with

B．make up of

C．decide on

D．look forward to

答案

答案：A

考查短语辨析。A容忍，忍受；B组成；C决定；D盼望。句意：特别是他不洗脚上床睡觉让他的室友不能忍受的。选A。

多选题

一个倾角为45°的光滑斜面处于水平的匀强电场之中，如图所示（图中未标出电场方向），带负电的质量为m的物体沿此斜面匀速下滑，则下列说法中正确的是

（　　）

A．电场的方向水平向左

B．物体下滑过程中电势能增加

C．物体下滑过程中机械能增加

D．电场力的大小为

2mg
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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.

52().

A.satisfaction 

B.disappointment 

C.astonishment 

D.regret
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