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【单选题】
患者男性，30岁，晨起及晚间躺下时咳大量脓痰，伴少量鲜血，并且痰液放置后分三层，可能是A.
慢性支气管炎
B.
肺癌
C.
肺结核
D.
支气管扩张症
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【单选题】First Planet from the Sun Mercury, the planet nearest the sun, is difficult to observe from the Earth because it rises and sets within two hours of the sun. ______【46】 Planetary scientists can estimat...
A.
Some regions on Mercury are heavily cratered, suggesting that they are very old surfaces that were probably formed about 4 billion years ago
B.
The crater was probably created by the impact of a large planetesimal when Mercury was forming
C.
Consequently, little was known about the planet until the Mariner 10 spacecraft made several flybys in 1974 and 1975
D.
Mercury is much smaller than the Earth
E.
The surface gravity is about one-third as strong as Earth's, and a thin atmosphere surrounds the planet
F.
These plains have relatively few impact craters (46)
【简答题】Which planet is the closest planet to the sun? Mercury, Mars, Venus or Jupiter?
【简答题】Our planet is in trouble．Polluting industries and corporations are destroying our planet, resulting in increasing global temperatures, melting ice caps, and economic turmoil（混乱）．All across the country...
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