Mum asked me to avoid out alone at night．
His wife is constantly finding ____ （过错）with him,which makes him very angry.
下列说法正确的有（ ）（1）整数就是正整数和负整数；（2）零是整数，但不是自然数；（3）分数包括正分数、负分数；（4）正数和负数统称为有理数；（5）一个有理数，它不是整数就是分数．
