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  3. Data from the pioneer spacecraft of the National Aeronautics and Space Administration(NASA)apparently prove the theory that the

Data from the pioneer spacecraft of the National Aeronautics and Space Administration(NASA)apparently prove the theory that the

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问题     Data from the pioneer spacecraft of the National Aeronautics and Space Administration(NASA)apparently prove the theory that the searing 900-degree Fahrenheit surface temperature of Venus is due to an atmospheric greenhouse effect caused mainly by a blanket of carbon dioxide. Such a greenhouse effect is created when energy in the form of sunlight easily passes through a planet’s atmosphere, warms its surface, and is converted to heat radiation that is then held in by the atmosphere. The orbiting spacecraft sampled Venus’ atmosphere from top to bottom, enabling NASA’s scientists to establish the exact amount of sunlight absorbed at various places in the planet’s atmosphere and on its surface.
    Measurements of atmosphere composition, temperature profiles(变化曲线), and radiative heating predicted Venus’ surface temperature very accurately. The planet is closer to the Sun than is Earth, and it has a relatively thin atmosphere like Earth’s, but Venus’ atmosphere consists of more than ninety percent carbon dioxide, compared to less than four percent in that of Earth. Because of its higher percentage of carbon dioxide, Venus’ atmosphere traps much more heat radiation than does Earth’s. Thus, the Venus researches are believed to be important to the understanding of possible adverse(不利的)effects on Earth’s agriculture and sea levels that could result from the long-term use of fossil fuels, which add carbon dioxide to the atmosphere.
According to the passage, how does the atmosphere of Venus differ from that of Earth?
选项 A、It contains much more carbon dioxide.
B、It holds significantly less moisture.
C、It is four percent thinner.
D、It traps less heat radiatioa
答案A
解析
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