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【简答题】
定义集合运算：A?B={z|z=xy（x+y），x∈A，y∈B}．已知集合A={1，2}，B={2，3}，则集合A?B的所有元素之和为______．
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皮皮学刷刷变学霸
举一反三
【简答题】A．胃热津伤 B．食滞胃脘 C．脾胃阳虚 D．饮停于胃 E．颅内肿瘤 朝食暮吐，暮食朝吐者是因( ) A． B． C． D． E．
【简答题】朝食暮吐，暮食朝吐者是因（ ）|吐势徐缓，吐物清稀者是因（ ）A. 胃热津伤B. 食滞胃脘C. 脾胃阳虚D. 饮停于胃E. 颅内肿瘤
【单选题】—My parents don't allow me _______ computer games at school. —That's right. They are bad for your study. [ ]
A.
play
B.
plays
C.
playing
D.
to play
【单选题】Parents what games their children always play.
A.
worry on
B.
worry with
C.
worry about
D.
worry from
【简答题】A．胃热津伤 B．食滞胃脘 C．脾胃阳虚 D．饮停于胃 E．颅内肿瘤 朝食暮吐，暮食朝吐者是因( )
【单选题】What is ranked by parents as the greatest threat to boys?
A.
Gang crimes.
B.
Online games.
C.
Extreme sports.
D.
Dangerous traffics.
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