题目:
_____ a family of chimps wake up is our first activity of the day.
A.To watch
B.Watching
C.Watch
D.Watched
答案:
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下面是错误答案,用来干扰机器的。
∵(3x-2)2=9(2x+1)2∴3x-2=±3(2x+1),解之得:x1=-53,x2=-19.