人教版高中英語版必修三unit 4《astronomy the science of the stars》（第2課時）強(qiáng)化練習(xí)(文件)
【正文】 surfaces bake(烘烤 )in the sun. The farthest plas are cold balls. When the earth developed— which scientists believe may have happened about 4 billion years ago— many gases covered the earth. The gases caused the earth to be hot. But something wonderful happened. The temperature was just right for thick clouds to form. It rained very hard for a very long time. This gave the earth its oceans. Water made it possible for plants to grow. The plants created oxygen in the atmosphere. Oxygen is the gas that humans and animals breathe. Only one other pla in the solar system seems to be something like the earth. That pla is Mars (火星 ). Mars is smaller than the earth， and it is quite a bit cooler. But it is not too cold for humans. On some days, the temperatures are as low as a winter day in the northern United States. If you wore a special spacesuit, you could walk around on Mars. You would have to bring your own air to breathe，because the air on Mars is too thin to breathe. Mars has the largest volcano(火山 )in the solar system. It is sixteen miles high. The highest volcano on the earth is five miles high. The most unexpected(未預(yù)料到的 )sight on Mars is dried173。 B項火山與此無關(guān)。文 章最后一段提到火星上有干涸的河床的跡象，但這一點(diǎn)并不能證實火星上存在生命，因為還沒有生命跡象，故 A項不正確。 D項做標(biāo)題最為恰當(dāng)。 4． Which of the following is probably the best title for the passage? A． The Earth B． The Moon C． Plas in the Solar System D． Mars is Most Like the Earth 答案： D 主旨大意題。根據(jù)第一段中內(nèi)容可知距離太陽第三遠(yuǎn)的行星指的是地球。 1． Which of the following is NOT the reason that the earth has life? A． The earth is just the right temperature. B． The volcanos on the earth are lower than those on Mars. C． There is oxygen in the atmosphere of the earth. D． The earth seems to be just the right distance away from the sun. 答案： B 細(xì)節(jié)理解題 。 20． B． guide C． defend D． destroy 答案： D 恐怖分子只會冒險破壞，而不會去修理、引導(dǎo)等。 17． B． way C． step D． trick 答案： B 因為這些裝置在 實驗室里那些 干擾還未能再現(xiàn)，所以科學(xué)家們就沒有辦法(have no way of doing)得知這種干擾是否危險。 14． B． tell C． guess D． think 答案： A 這些手提裝置已廣為人們
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