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【单选题】
关于呼吸道合胞病毒肺炎的发病年龄正确的是（）A.
多见于1岁，尤以6个月以内小儿多见
B.
多见于2岁以内，尤以6个月以内小儿多见
C.
多见于3岁以内，尤以6个月以内小儿多见
D.
多见于1～3岁，尤以2～6个月小儿多见
E.
多见于4～5岁，尤以6个月以内小儿多见
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举一反三
【单选题】The earth is about as the moon.
A.
as fifty time big
B.
fifty times as big
C.
as big fifty times
D.
fifty as times as
【单选题】The Earth is about as the moon.
A.
as forty-nine time big
B.
forty-nine times as big
C.
as big forty-nine times
D.
forty-nine as times big
【简答题】阅读理解。 The earth is about 4,600 million years old. Modern man has lived on the earth for only 35,000 years, but during that time, we have changed our planet in many ways. Many of the things that we hav...
【简答题】氧化作用和磷酸化作用相偶连的部位是
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