一、精心选一选（单项选择，每小题3分，共30分）：
1．2017 的相反数是············································································（ ）
A．2017 B．–2017 C． D．
2．大于–2.5而小于3.5的整数共有······················································· ···（ ）
A．6个 B．5个 C．4个 D．3个
3．64的平方根是·················································································（ ）
A．8 B．±8 C．4 D．±4
4．在实数，，0，，，中，有理数有···························（ ）
A．1个 B．2个 C．3个 D．4个
