类ostream的成员函数______用于执行无格式输出，成员函数______用于输出单个字符。
参考答案：write、put
Babies are interested in ______ they find and are likely to put it into their mouths.
A．no matter what
B．no matter which
C．whatever
D．whichever
尿毒症病人高血钾时，不宜食用（）
A.橘子
B.香蕉
C.广柑
D.桃子
E.西瓜
