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Samples taken from the ice of glaciers show that during the last ice age there was far more dust in the atmosphere than there is now. Since greater amounts of dust in the atmosphere would result in less sunlight`s reaching the Earth`s surface, it is likely that the large amount of dust then present helped maintain low global temperatures and thus prolonged the ice age.

第1题

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 Earth`s 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 Earth's surface.

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