新GRE阅读理解36套每日讨论--24（群14106147）

普渡哥

  The molecules of carbon dioxide in the Earth‘s
  atmosphere affect the heat balance of the Earth by
  acting as a one-way screen. Although these molecules
  allow radiation at visible wavelengths, where most of
5 the energy of sunlight is concentrated, to pass
  through, they absorb some of the longer-wavelength,
  infrared emissions radiated from the Earth‘s surface,
  radiation that would otherwise be transmitted back
  into space. For the Earth to maintain a constant aver age
10 temperature, such emissions from the planet must
  balance incoming solar radiation. If there were no
  car-bon dioxide in the atmosphere, heat would escape
  from the Earth much more easily. The surface temperature
  would be so much lower that the oceans might be a solid mass
15 of ice. (120 words)


3. According to the passage, the greatest part of
the solar energy that reaches the Earth is
(A) concentrated in the infrared spectrum
(B) concentrated at visible wavelengths
(C) absorbed by carbon dioxide molecules
(D) absorbed by atmospheric water vapor
(E) reflected back to space by snow and ice


For the following question, consider each of the choices separately and select all that apply


4. According to the passage, atmospheric carbon
dioxide performs which of the following functions
□A absorbing radiation at visible wavelengths
□B absorbing outgoing radiation from the Earth
□C helping to retain heat near the Earth‘s surface

普渡哥

晕，大家今天全对了。练练水平果然不一样，明天继续练啊：）

天天阅读明天见！

xling332

B
BC

zjusolo1985

B BC

josie0710

B
BC