B.to use mobile phones less often
C.to update regular phones
D.to stop using mobile phones
答案:B 主旨大意题。本文谈论了使用手机对人健康是否有害,在最后一段点明了本文的目的在于建议人们不要太经常地使用手机,故B项正确。
阅读理解, 从给的四个选项 (A、B、C和D) 中, 选出最佳选项。
The earth is getting warmer. Over the past 100 years Earth’s temperature rose by about 1°F. Scientists predict that Earth will continue to warm by about 2—6°Fover the next 100 years. That may not sound like much, but think about this: During the last Ice Age, Earth was only 9°F cooler than it is today, and large sheets of ice called glaciers(冰河) covered large parts of North America! The warming of Earth’s climate is called global warming
Scientists are not sure of what causes climate change. Earth could be warming on its own, however, most scientists believe that human activity is speeding up the climate change. Earth warms itself through a process called the greenhouse(温室) effect. When sunlight enters Earth’s atmosphere(大气), it passes through a layer of greenhouse gases. Greenhouse gases occur naturally, but humans also create them by burning fossil fuels. When sunlight hits Earth’s surface it bounces_back toward the sky. The greenhouse gases trap some of the sunlight on Earth and allow the rest to go back into space, making Earth’s temperature warm. The process works much in the same way as a greenhouse, hence its name. If there are too many greenhouse gases in the atmosphere, too much sunlight may be trapped, making Earth warmer.
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