D. tell people how to create environmentally safe houses
67. J. Craig Venter was a scientist who ________.
A. explored how fish see in the ocean
B. recorded the genetic information of small sea creatures
C. made a trip across the Mediterranean, Red Sea and Indian Ocean
D. was engaged in stopping pollution
68. The above passage is probably taken from _________.
A. a textbook
B. a science-fiction
C. a news report
D. a TV talk show
D
Of all the problems facing modern astronomers, perhaps the most fascinating is: “Can intelligent(有智能的) life exist elsewhere?” Since the Earth is an unimportant planet moving round an unimportant star, it would be a pride on our part to suppose that we are the only intelligent beings in the universe. But to obtain proof is difficult.
The main trouble is that our neighbor worlds, the bodies in the solar system appear to be unsuitable for advanced life forms. The Moon may be ruled out at once; it has hardly any atmosphere. Venus(金星) is little better; the surface temperature is extremely high and the atmosphere is mostly carbon dioxide. Mars(火星) with a very thin atmosphere and a severe shortage of water, may well support simple plant life but there seems no hope of finding animals, while the attractive Martians of the story–tellers have long since been given up.
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