问题 选择题

当把上面刻有“d”字的载玻片放在显微镜下观察时,视野中看到的图象应是(  )

A.p

B.d

C.q

D.b.

答案

显微镜成倒立的像.“倒立”不是相反,是旋转180度后得到的像.即上下相反、左右相反.“d”旋转180度后得到的是“p”.

故选:A.

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

5. The last paragraph means ______.

A. we should have laws to stop having pets at home

B. wild animals shouldn't adopted as pets

C. laws should be passed to avoid pets' diseases spreading

D. people with pets should be stayed at home

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