单选题：In the third paragraph the author wants to tell the reader

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题目内容：
In the third paragraph the author wants to tell the reader that______． A．it is natural for teenagers to stay up late and get up late
B．staying up late has a bad effect on teenagers’ability to think and learn
C．during puberty most teenagers experience a kind of gray cloud
D．it is hard for teenagers to get out of bed in the morning

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Making Light of SleepAll we have a clock located inside our

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Individuals with autism are particularly weak at______

Individuals with autism are particularly weak at______A．different techniques B．s

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关于胰腺癌，以下说法错误的是

关于胰腺癌，以下说法错误的是A．好发于胰头部 B．好发于40岁以上男性 C．血淀粉酶升高 D．碱性磷酸酶降低 E．糖尿病发生胰腺癌的危险性高于一般人群

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患者女，32岁。既往体健，体检时发现肝功能正常，抗一HBs阳性，反复查HBV其他血清标记物均为阴性。表示患者为

患者女，32岁。既往体健，体检时发现肝功能正常，抗一HBs阳性，反复查HBV其他血清标记物均为阴性。表示患者为A．乙型肝炎恢复期 B．乙型肝炎有传染性 ． C．

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The Doctor in America Self-employed private physicians who

The Doctor in America Self-employed private physicians who charge a fee for ea

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