2、constant adj.

　　根据语境猜词义

　　(1)The babies need constant attention from their parents.

　　(2)He couldn't finish the task in time because of the constant interruptions.

　　(3)He is driving his car at a constant speed of 100 meters per hour on the high way.

　　根据语义找匹配：A. 经常的　B. 不断的，反复的　C. 固定的，恒定的

　　(1) A　(2) B　(3) C

　　constantly adv. 不断地，经常地，反复地

　　根据括号内的汉语提示填空

　　The mother said to her little son before she died, “Nothing in the world is constant (固定的). I mean everything is constantly (不断地)changing. So you should pay constant (经常的) attention to the things around you, and correct your decision in time. ”

　　3、previous adj.

　　根据语境猜词义

　　(1)Don't be too previous about refusing.

　　(2)Have you ever had any previous career experience?

　　(3)She has two children from the previous marriage.

　　(4)Previous to the conference, we discussed the problem among ourselves.

　　根据语义找匹配：A. 以前的，过去的，旧的　B. 先前的，事前的　C. 在……之前的　D. 过早的，过急的

　　(1) D　(2) B　(3) A　(4) C

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