Engines are to machines _________ hearts are to animals. 
A．a(chǎn)sB．thatC．whatD．which
C
此題主要測試以下句型結(jié)構：A is to B what C is to D。意思：A對于B的重要性，就如同C對于D的重要性一樣。此句型中what從句在主句中起表語作用，同時what在從句中也起表語作用（這一點老師應該掌握，然而學生只需記住該句型結(jié)構即可）。例如：Railway is to transportation what blood is to a man's body。鐵路對于交通的重要性，就如同血液對于身體的重要性一樣。
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