题目

The students ______many questions about life yesterday.A.thought B.think of C.think over D.thought about 答案:【答案】D【解析】句意:昨天学生们思考了许多关于生活的问题。考查动词词组。A. thought认为;B. think of想到;C. think over仔细考虑;D. thought about考虑;由时间状语yesterday排除B、C;根据句意是考虑的意思,可知选D项。先化简,再求值.(1)2(x2y+xy)-3(x2y-xy)-4x2y,其中x=1,y=-1.(2)(xy-32y-12)-(xy-32x+1),其中x=103,y=83.
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