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问题
填空题
计算：（x+y）（x-y）（x
2
+y
2
）=（ ）。
答案
选择题
May is _______ month of the year.
A. five
B. the fiveth
C. fifth
D. the fifth
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选择题
— Let's go on a trip next Sunday.
— That sounds ______. I am looking forward to it.
A. well
B. good
C. badly
D. bad
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