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【单选题】
使用数据类型名称转换方法将双精度浮点型变量转换为单精度浮点型变量，以下正确的是（ ）A.
double c=1.5; b=(float)c;
B.
int c=1.5; b=(float)c;
C.
float c=1.5; b=(double)c;
D.
string c="1.5"; b=(float)c;
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举一反三
【单选题】（辽宁卷） 23 ． Susan decided not to work on the program at home because she didn’t wanther parents to know what she __________.
A.
． has done
B.
． had done
C.
． was doing
D.
． is doing
【单选题】The football player felt extremely _____________ after they won the .
A.
luck
B.
lucky
C.
luckily
D.
unlucky
【单选题】Susan decided not to work on the program at home because she didn’t want her mother to know what she _____.
A.
has done
B.
had done
C.
was doing
D.
is doing
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