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【单选题】
执行下列语句：istringstreamstrin(“38.5”);doublex=0,y=0;strin>>x>>y;执行后变量x和y的值分别为（ ）。A.
0, 0
B.
3.0, 8.5
C.
8.5, 3.0
D.
3, 8
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