Engines are to machines _________ hearts are to animals.
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答案C

此题主要测试以下句型结构:A is to B what C is to D.意思:A对于B的重要性,就如同C对于D的重要性一样.此句型中what从句在主句中起表语作用,同时what在从句中也起表语作用(这一点老师应该掌握,然而学生只需记住该句型结构即可).例如:Railway is to transportation what blood is to a man's body.铁路对于交通的重要性,就如同血液对于身体的重要性一样.