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If the population of the Earth keeps on       (increase) at its present rate, there will       (eventual) not be enough resources left to support life on the planet. By the middle of the 21st century, if present trends continue, we        (use) up all the oil that drives our cars, for example. Even if scientists develop new ways of feeding the human race, the crowded conditions on Earth will make it      (necessity) for us to look for open space somewhere else. But      of the other planets in our solar system are capable of supporting life at present. One possible solution to the problem,      , has recently been suggested by an American scientist, Professor Carl Sagan. Sagan believes that        the Earth’s resources are completely      (exhaust), it will be possible to change the atmosphere of Venus and       create a new world almost as large as the Earth itself. The difficulty is that Venus is much hotter than the Earth.     , there is only a tiny amount of water there.

科目 英语   题型 填空题   难度 中等
知识点: 语法填空
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Alice: Mr. Black, This is Alice speaking. I’m calling to ask you __ I can take the afternoon off today.
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