Question

Engines are to machines _________ hearts are to animals. 

A．as

B．that

C．what

D．which

Answer 1

C解析:
此題主要測試以下句型結構：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。