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【单选题】
实验室使用的折射油的成分是A.
纯的二碘甲烷溶液
B.
纯的三溴甲烷
C.
溶解硫单质的二碘甲烷
D.
解硫单质的三溴甲烷
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参考解析：
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【单选题】Questions 1 and 2 are based on the news report you have just heard. 1. A) He set a record by swimming to and from an island. B) He celebrated his ninth birthday on a small island. C) He visited a pris...
A.
He set a record by swimming to and from an island.
B.
He celebrated his ninth birthday on a small island.
C.
He visited a prison located on a faraway island.
D.
He swam around an island near San Francisco.
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