单选题 The ship's generator broke down, and the pumps had to be operated ______ instead of mechanically.

【正确答案】 A

【答案解析】manually用手地；artificially人工地；automatically自动地；synthetically综合地。根据题意应选A项。句意为：船的发电机坏了，不得不用手工代替机械来操纵水泵。