问题 单项选择题

燃煤蒸汽锅炉的配套设备——麻石除尘器的工作原理和效能是()。

A.废气由下部沿切线方向进入,由引风机从上部抽出,水从上部喷淋泻下。可清除废气中的粉尘,不能清除二氧化硫

B.由若干个小的旋风子并联组合而成。可清除废气中的粉尘,不能清除二氧化硫

C.其工作原理同A。但既可清除废气中的粉尘也能清除其中的二氧化硫

D.其工作原理同B。但既可清除废气中的粉尘也能清除其中的二氧化硫

答案

参考答案:C

解析:

此题已不在新大纲考核范围之内。

单项选择题
阅读理解

阅读理解。

     We have met the enemy and he is ours. We bought him at a pet shop. When monkey-pox, a disease usually

found in the African rain forest suddenly turns up in children in the American Midwest. It's hard not to wonder

of the disease that comes from foreign animals is homing in on human beings. "Most of the infections (感染)

we think of as human infections started in other animals." says Stephen Morse, director of the Center for Public

Health Preparedness at Columbia University.

     It's not just that we're going to where the animals are; we're also bringing them closer to us. Popular foreign

pets have brought a whole new disease to this country. A strange illness killed Isaksen's pets and she now thinks

that keeping foreign pets is a bad idea. "I don't think it's fair to have them as pets when we have such a limited

knowledge of them." says Isaksen.

     "Laws allowing these animals to be brought in from deep forest areas without stricter control need changing."

says Peter Schantz. Monkey-pox may be the wake-up call. Researchers believe infected animals may infect their

owners. We know very little about these new diseases. A new bug (病毒) may be kind at first. But it may

develop into something harmful (有害的). Monkey-pox doesn't look a major infectious disease. But it is not

impossible to pass the disease from person to person.

1. We learn from Paragraph l that the pet sold at the shop may _____. [ ]

A. come from Columbia

B. prevent us from being infected

C. enjoy being with children

D. suffer from monkey-pox

2. Why did Isaksen advise people not to have foreign pets? [ ]

A. They attack human beings.

B. We need to study native animals.

C. They can't live out of the rain forest.

D. We do not know much about them yet.

3. What does she phrase "the wake-up call" in paragraph 3 most probably mean? [ ]

A. a new disease

B. a clear warning

C. a dangerous animal

D. a morning call

4. The text suggests that in the future we _____. [ ]

A. may have to fight against more new diseases

B. may easily get infected by diseases from dogs

C. should not be allowed to have pets

D. should stop buying pests from Africa