问题 单项选择题

延时曝气法处理低浓度有机废水时,是利用( )的微生物。

A.迟缓期
B.对数期
C.稳定期
D.衰亡期

答案

参考答案:D

解析: 延时曝气法处理低浓度有机废水时,利用衰亡期的微生物,细菌因缺乏营养而利用储存物质进行内源呼吸,细菌自身溶解来提高有机负荷,满足微生物的营养要求,从而取得较好的处理效果。

完形填空

根据短文内容,从短文后的选项中,选出能填入空白处的最佳选项,选项中有两项为多余选项。

Warren Harding was the 29th President of the United States, serving from 1921 until his death in 1923.   小题1:  One was a successful international conference (会议).

After World War One, Britain, Japan and the United States expanded their navies (海军). They built bigger and bigger ships. Many members of the United States Congress worried about the cost.   小题2:  They asked President Harding to organize a conference to discuss these issues.

 小题3:  President Harding invited representatives from the major naval powers of the time  Britain, Japan, France and Italy. He also invited representatives from countries with interests in Asia and Europe  China, Portugal, Belgium and the Netherlands. He did not invite the new Soviet leaders in Russia.

Mr Harding’s Secretary of State, Charles Evans Hughes, spoke.   小题4:  He proposed that the world’s strongest nations should stop building warships for ten years. He also proposed that Britain, Japan, and the United States should destroy some ships to make their navies smaller immediately.

 小题5:  It involved the misuse of underground oil owned by the federal government. Warren Harding was an honest man. But he did not have a strong mind of his own. He was easily influenced. And he often accepted bad advice. He explained the problem with these words, “I listen to one side, and they seem right. Then I listen to the other side, and they seem just as right. I know that somewhere there is a man who knows the truth. But I do not know where to find him.”

A.He is remembered mostly for two events.

B.The conference was not a complete success.

C.They also worried about increased political tension (紧张) in Asia.

D.The conference was held in Washington in November, 1921.E. President Harding appointed several men of great ability to his cabinet (内阁).

F. He offered the conference a detailed plan to reduce the size of the world’s major navies.

G. The second thing for which President Harding is remembered is the Teapot Dome scandal (丑闻).

填空题