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  3. The energy source on Voyager 2 is not a nuclear reactor, in which atoms are actively broken apart; rather a kind of nuclear batt

The energy source on Voyager 2 is not a nuclear reactor, in which atoms are actively broken apart; rather a kind of nuclear batt

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问题 The energy source on Voyager 2 is not a nuclear reactor, in which atoms are actively broken apart; rather a kind of nuclear battery that uses natural radioactive decay to produce power.
选项 A、apart; rather
B、apart, but rather
C、apart, but rather that of
D、apart, but that of
E、apart; it is that of
答案B
解析 C、D、E中that of属多余，它们的加入会导致句意无法理解。因为that指代anuclear reactor，把其代入C、D、E，就成为a nuclear reactor of a kind of nuclear battery，不知所云。且E中省去but，用分号连接，弱化了转折语气。A rather单独出现只能作为形容词，与本句句意不符，要表示转折需要与than或but连用才正确。
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