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【单选题】
Paragraph 1 Valerie opened up the letter from the military department. She felt the pit of her stomach drop to the bottom of the earth before she even opened it. She knew it was news about John. As she read the first line, she thought of all the lunches she had packed him and all the nights she tucked him in his bed and warded off the nighttime monsters. The man carrying the flag put his hand on her shoulder. She thought of the day that John signed up for the military. Her tears wet the letter. She stopped reading after the first line. What was most likely Valerie’s relationship to John?A.
She was his mail delivery person.
B.
She was his sister.
C.
She was his mother.
D.
She was his wife.
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【单选题】Your English is excel -Your English is excellent ! -_____
A.
Just so so.
B.
No,my English is poor.
C.
Thank you.
D.
You are right.
【多选题】变量dx、dy和dz的声明和初始化如下：double dx = (double) x; double dy = (double) y; double dz = (double) z;若float和double分别采用IEEE 754单精度和双精度浮点数格式，sizeof(int)=4，则对于任意int型变量x、y和z，以下哪个关系表达式是永真的？
A.
dx*dx >= 0
B.
(double)(float) x == dx
C.
dx+dy == (double) (x+y)
D.
(dx+dy)+dz == dx+(dy+dz)
E.
dx*dy*dz == dz*dy*dx
F.
dx/dx == dy/dy
【单选题】变量dx、dy和dz的声明和初始化如下: double dx = (double) x; double dy = (double) y; double dz = (double) z; 若float和double分别采用IEEE 754单精度和双精度浮点数格式,sizeof(int)=4,则对于任意int型变量x、y和z,以下关系表达式中永真的是(__)。
A.
(dx+dy)+dz == dx+(dy+dz)
B.
dx/dx == dy/dy
C.
dx*dy >= 0
D.
dx*dy*dz == dz*dy*dx
【单选题】以下关于 float 型变量和 double 型变量的描述,不正确的是( )。
A.
double 型变量精度更高
B.
double 型变量更常用
C.
double 型变量的取值范围更大
D.
double 型变量占用的存储空间更大
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