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  3. The radiopharmaceuticals used in nuclear medicine emit gamma rays that can be detected externally by special types of cameras.

The radiopharmaceuticals used in nuclear medicine emit gamma rays that can be detected externally by special types of cameras.

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问题 The radiopharmaceuticals used in nuclear medicine emit gamma rays that can be detected externally by special types of cameras.
选项 A、bestow
B、exhibit
C、impose
D、discharge
答案D
解析 emit“发出，放出”。bestow“赠给，授予”：exhibit“陈列，展览，呈现”；impose“强加”：discharge“放出，流出，发射”。从各选项意思可以看出，只有D项跟画线词义相接近，都含有“发出，放出”之意，故选D。
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