题目内容

Which of the following, if true, most seriously weaken the argument?
• ALarge amount of dust in the atmosphere would tend to keep heat from the Sun that reached the Earths surface from escaping into outer space
• BThe glacial samples show that during the period between the two most recent ice ages the level of atmospheric dust was far lower than it was during either of ice ages
• CVolcanic eruptions in the recent past have released sufficient dust to cause detectable changes in global temperature patterns
• DThe amount of dust in the atmosphere was significantly greater in the middle of the last ice age than at the end
• ESunlight is the main heat source of the Earths surface.

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