举一反三
- what the analogy is: which two things are being compared?The earth’s atmosphere is like a blanket of gases around the earth. It is only a thin layer but it helps to maintain the temperature of the earth, keeping us warm. It also offers a layer of protection from the intensity of the sun. A: earth’s atmosphere and a blanket B: earth’s atmosphere and gases C: earth’s atmosphere and a layer of protection D: earth’s atmosphere and a blanket of gases
- A variety of gases trapped in the Earth’s atmosphere can ensure life on Earth because they are ______.
- What is the main cause of the significant change in the earth’s atmosphere?
- Which of the following refers to the retention of the Sun's warmth in the Earth's lower atmosphere by greenhouse gases?
- True or False: If the Earth's atmosphere did not have the Greenhouse Effect, the Earth would be much warmer. A: True B: False
内容
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If we had taken such effective measures much earlier, the river _____ so seriously now. A: is not polluted B: would not be polluted C: had not been polluted D: would not have been polluted
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2. Carl Sagan believes that Venus might be colonized from earth because ____. A: it might be possible to change its atmosphere B: its atmosphere is the same as the earth’s C: there is a good supply of water on Venus D: the days on Venus are long enough
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The main difference between the Earth's atmosphere and the simulated one is ______. A: their size. B: their content. C: their height. D: their density.
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The particles in the atmosphere can affect the Earth's climate. A: air current B: dust C: clouds D: ays
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Choose the correct words or phrases to complete the sentences. The explosion on the sun cannot be heard, there ____ no air between the earth’s atmosphere and the sun.