鼠控制标准中要求有鼠洞、鼠粪、鼠咬痕等鼠迹的房间不超过（）。
A.2%
B.5%
参考答案：A
There is a wide ________of reference books to be found, so ________you look for some material needed, you can turn to me.
A．kind; the last time
B．sort; every time
C．variety; next time
D．type; the moment
带锯床直线锯削时，采用较（）的锯条。
A、宽
B、窄
C、粗齿
D、细齿
