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【单选题】
Jane was nervous _______A.
because she was worried about the birthday party
B.
because she found this history course very challenging
C.
because she thought her term paper might be late
D.
because she had a very hard time sleeping
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【单选题】设int型变量a、b，float型变量x、y，char型变量ch均已正确定义并赋值，正确的switch语句是( )。
A.
switch(x+y){……}
B.
switch(ch+1){……}
C.
switch ch{……}
D.
switch(a+b)：{……}
【单选题】设int型变量a、b，float型变量x、y，char型变量ch均已正确定义并赋值，则正确的swith语句是( )。
A.
switch (x+y) {...}
B.
switch (ch+1) {...}
C.
switch ch {...}
D.
switck (a+b) {...}
【单选题】设x为float型变量，y为double型变量，a为int型变量，b为long型变量，c为char型变量，则表达式 x+y*ax+by+c的值为( )类型。
A.
int
B.
long
C.
double
D.
char
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