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【单选题】
集合M={5,4,3,2,1}M的子集个数是 ( )A.
32
B.
31
C.
16
D.
15
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反馈参考答案：
举一反三
【判断题】Folk tales say the game originates from the activities of seeking Qu Yuan's body, but experts, after painstaking and meticulous research, conclude that dragon boat racing is a semi-religious, semi-ent...
A.
正确
B.
错误
【单选题】The Power of Pretend You peak into your seven-year-old's room to see how he and his best friend are going with their playtime. They are deep in a make-believe game in which the superhero fights a mons...
A.
Y
B.
N
C.
NG
【简答题】And experts say a______ can actually be a serious problem.
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