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【单选题】
鲤鱼比田螺更有营养。但是，因为金枪鱼比小黄鱼更有营养，所以鲤鱼比小黄鱼更有营养。 以下除了哪项外，都可以作为题干成立的一个必要前提
A.
鲤鱼与金枪鱼同样有营养。
B.
田螺比小黄鱼更有营养。
C.
田螺比金枪鱼更有营养。
D.
田螺与金枪鱼同样有营养。
E.
金枪鱼比鲤鱼更有营养。
参考答案：
参考解析：
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【单选题】Passage Four Initial voyages into space introduced questions scientists had never before considered. Could an astronaut swallow food in zero gravity To keep things simple, astronauts on the Project ...
A.
was an unusual problem among astronauts
B.
was what puzzled the early scientists
C.
caused new problems in space flights
D.
drew the attention of the general public