The doctor told me to take the medicine 　　　　.
A．every fourth hours
B．each fourth hour
C．each four hours
D．every four hours
D

試題分析：句意：醫(yī)生告訴我要每四個小時吃一次藥。表示每幾個小時，every +基數(shù)詞+復數(shù)名詞；或every+序數(shù)詞+單數(shù)名詞。故選D。
點評：本題難度適中。固定短語主要考查它們的意義及用法，但是它們是在一定的語言環(huán)境下而出現(xiàn)的，所以考生必須能正確理解句子的句意。
即學即練：The trains to New York run 　　　　.
A. every second hours
B. each second hour
C. each two hours
D. every two hours
解析：D。句意：到紐約的列車每兩小時有一班。
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