The __________ to the rocket going into space went wrong, and as a result it exploded and fell into the sea.
A．markB．signC．symbolD．signal
D

試題分析：A．mark記號，B．sign跡象，標(biāo)志，C．symbol象征，D．signal信號，句意：進(jìn)入太空的火箭信號出了問題，因此它爆炸了掉入海里。根據(jù)句意選D。
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