皮皮学，免费搜题
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【单选题】
电子显微镜的光源是( )A.
可见光
B.
紫外线
C.
X射线
D.
电子枪
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【单选题】There is an English saying,' Laughter is the best medicine.' Until recently, few people took the saying seriously. Now, however, doctors have begun to look into laughter and the effects it bas on the ...
A.
smiling does good to health
B.
laughter can be tolerated
C.
there is a way to reduce pain
D.
laughter can work the muscles in the feet
【单选题】Passage One There is an English saying,' Laughter is the best medicine.' Until recently, few people took the saying seriously. Now, however, doctors have begun to look into laughter and the effects it...
A.
smiling does good to health
B.
laughter can be tolerated
C.
there is a way to reduce pain
D.
laughter can work the muscles in the feet
【单选题】Passage 3 (79) There is an English saying: 'Laughter is best medicine,' Until recently, few people took the saying seriously. Now, however, doctors have begun to look into laughter and the effects it ...
A.
smiling does good to health
B.
laughter can be tolerated
C.
there is a way to reduce pain
D.
laughter can work the muscles in the feet
【简答题】There is an English saying :“laughter is best medicine .”Until recently ,few people took the saying seriously .Now however ,doctors have begun to look into laughter and the effects it has on the human...
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