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Essentially all polar ice forms from precipitation that falls as snow. Extremely cold air can not hold much moisture and consequently can not produce much snowfall. In recent years, air masses in both polar regions have been, without expectation, extremely cold.
The information above most strongly supports which of the following conclusions?
A If polar ice is currently growing and expanding at all, it is doing so only slowly.
B If air temperatures in the polar regions were considerably warmer, much polar ice would melt off
C In the last few years, snowfall in the polar regions has been virtually continuous
D The thicker the polar ice is ,the colder the air masses that are in contact with it
E For snow to turn into ice in the polar regions, the air has to be extremely cold
Why choose A?
36 In 1987 sinusitis was the most common chronic medical condition in the U.S, followed by arthritis and high blood pressure, in that order. The incidence rates for both arthritis and high blood pressure increase with age, but the incidence rate for sinusitis is the same for people of all ages. The average age of the U.S population will increase between 1987 and 2000
Which of the following conclusions can be most properly drawn about chronic medica conditions in the U.S from the information given above?
A Sinusitis will be more common than wither arthritis or high bloood pressure in 2000
B Arithritis will be the most common chronic medical condition in 2000
C the average age of people suffering from sinusitis will increase between 1987 and 2000
D Fewer people wil suffer from sinusitis in 2000 than suffered from it in 1987
E A majority of the population will suffer from at least one of the medical conditions mentioned above by the year 2000
Why choose C?
第一题：冷空气不能hold很多湿气，也不会下很多雪，但是南北极的冰是了来自于雪。
A：南北极冷啊－－》不能hold很多湿气－－－》不能下很多雪。但是如果南北极的ice一直在增加，只能说明是在缓慢增加。
第二题：S病是最常见的病，关节炎和高血压紧随其后。但是后面两者和年龄有关，而S病出现在个个阶层
现在平均年龄增加了,则S病的平均年龄也会增加。S病的平均年龄接近于人口的平均年龄来理解就OK了。其它4个选项都不对。AB只关注了后两个病的一个。D和E没有什么根据。
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