46. Why has the Hubble lasted longer than scientists expected?
A. The environment has changed a lot.
B. It used the most advanced technology.
C. People have been able to fix it.
D. It can be sent back to Earth for checks. 47. What happened to the Hubble recently?
A. It ran away from its orbit. B. It nearly ran out of energy.
C. It was hit by a small comet. D. It had some technical problems.
48. Which of the following can replace the underlined word “images” in Paragraph 4?
A. Appearances.
B. Pictures.
C. Impressions.
D. Opinions.
49. What does Frank Summers think of the Hubble?
A. It looks like a bird flying in the universe. B. It can not be replaced by anything else now.
C. It will be the best telescope for a long time. D. It is much more useful than other telescopes.
50. We can learn from the text that the Hubble .
A. is the only space telescope in the universe
B. has moved around Earth one million times
C. has helped scientists learn about black holes
D. is mainly used for taking pictures of the universe
4.The Washington National Zoo is a 163-acre (英亩) zoo located in the Woodley Park section of Washington D.C. Unlike most zoos, visiting the National Zoo is free of charge. Founded in 1889, the National Zoo was first supposed to perform as an institute to breed (培育) endangered American animals and to educate Americans about such animals.
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