You don’t have to every new word in the dictionary while reading. A. look forB. look upC.

问题补充：

You don’t have to every new word in the dictionary while reading.

A. look for

B. look up

C. look at

D. look after

答案：

A. look for

(答案→)B. look up

C. look at

D. look after

解析：look for寻找;look up查阅,向上看;look at看;look after照顾,关心.句意:当读书时,你必须在词典中查阅每个新单词.结合语境可知选B.