下列变量声明合法的是( )。
A．short a=1.4e-1;
B．double b=1+3e2.8;
C．long do=0xfdaL;
D．float2_aaa=1e-3;
参考答案：A
解析： 解答本题需了解3个知识点：①标识符是由字母、数字或下画线组成，并且它的第一个字符必须是字母或者下画线；②do是 C语言中的一个关键字，不能再用做变量名和函数名；②C语言规定指数形式的实型常量e或E后面的指数必须是整数。
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