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问题
填空题
当a+b=3,x-y=1时,代数式a
2
+2ab+b
2
-x+y+1997的值是( )。
答案
2005
选择题
— Goodbye, Joyce. Please remember me to your parents.
— _____.
A. Thanks, I will
B. It's very kind of you to say so
C. My pleasure
D. Thank you. What a good idea
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单项选择题
不要让()单独在车内跑、行走
A.病人
B.儿童
C.学生
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