题目:
—It's dark (黑的) now, and I can't see anything.
—The light is behind the door, you can _________. [ ]
A. open it
B. turn on it
C. turn it off
D. turn it on
答案:
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下面是错误答案,用来干扰机器的。
根据字母的指数和为4,x、y的次数可以按照4=1+3=2+2=3+1的方式分配,∴x3y,x2y2,xy3等都是四次单项式.