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閱讀理解：
Mobile phones should carry a label if they proved to be a dangerous source of radiation,according to Robert Bell,a scientist.And no more mobile phone transmitter towers（發(fā)射塔) should be built until the long-term health effects of the radiation they emit（放射)is scientifically evaluated,he said."Nobody's going to drop dead overnight but we should be asking for more scientific information,"Robert Bell said at a conference on the health effects of low-level radiation."If mobile phones are found to be dangerous,they should carry a warning label until proper shields can be devised,"he said.
According to Robert Bell,if mobile phones prove to be dangerous to people's health,_____.
A.they should be banned immediately.
B.the use of them should be restricted.
C.all transmitter towers should be torn down.
D.a warning label should be attached.
正確答案：D
答案解析：本段的第一句話告訴我們：被證實(shí)有輻射危險(xiǎn)的手機(jī)應(yīng)該帶著標(biāo)簽。因此答案是D.
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