This passage mainly discusses that ______.

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• 第1题：

  (Only) when I got there (I realized) how (badly) the house had been (damaged).
  A．Only
  B．I realized
  C．badly
  D．damaged
  

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• 第2题：

  I (enjoy) eating in (good) restaurants and (to go) to the theater (afterwards).
  A．enjoy
  B．good
  C．to go
  D．afterwards
  

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• 第3题：

  It can be concluded that a concentration of carbon dioxide in the atmosphere would ______.
  A．prevent the sun's rays from reaching the earth's surface
  B．mean a warming up in the climate in the Arctic hemisphere
  C．account for great changes in the climate in the northern hemisphere
  D．raise the temperature of the earth's surface
  

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• 第4题：

  Although the fuel consumption is greater in the northern hemisphere, temperatures there seem to be falling. This is ______.
  A．mainly because the levels of carbon dioxide are rising
  B．possibly because the ice caps in the poles are melting
  C．exclusively due to the effect of the inertia of the earth's climate
  D．partly due to variations in the output of solar energy
  

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• 第5题：

  The article was written to explain ______.
  A．the greenhouse effect
  B．the models of solar-weather interactions
  C．the solar effects on earth
  D．the causes affecting weather
  

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• 第6题：

  If the assumption about the delay of a new Ice Age is correct ______.
  A．the best way to overcome the cooling effect would be to burn more fuels
  B．lee would soon cover the northern hemisphere
  C．the increased levels of carbon dioxide in the atmosphere could warm up the earth even more quickly
  D．the greenhouse effect could work to the advantage of the earth
  

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