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【单选题】
Molish 反应的试剂组成是A.
苯酚-硫酸
B.
α-萘酚-浓硫酸
C.
β-萘酚-硫酸
D.
萘-硫酸
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举一反三
【简答题】桥梁由桥面、 、墩台及基础三大部分组成。A. 桥跨结构
【单选题】It is important _________. [ ]
A.
to stay health
B.
to stay healthy
C.
stay health
D.
stay healthy
【单选题】Doctors tell people _____ their hands often and to stay at home if they feel ill. [ ]
A.
to wash
B.
washes
C.
wash
D.
washing
【简答题】阅读理解。 Growing up in Philadelphia, Lieberman started cooking with his stay-at-home dad when he was seven. His food-loving family had two kitchens, and he quickly learned what was the best way to bake h...
【简答题】Food is life; it gives us the nourishment (营养) we need to stay alive and be healthy. __ 1 __ Brian Wansink, a professor at the University of Illinois, says we also eat certain foods because they make...
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