下列企业中，属于专业发票使用范围的有( )。
A．商品零售发票
B．国有邮政、电信企业
C．国有铁路企业
D．国有金融企业
参考答案：B,C,D
Tom: Would you like me to water your plants while you’re on your holiday?
Joe: ________
A．No problem. I was more than glad to do it.
B．I appreciate it, but I’m already finished watering them.
C．Thanks for offering your help, but my brother’s going to do it.
D．Certainly watering plants is my favorite pastime.
关于钨的描述错误的是（）。
A.熔点最高的金属
B.在高温时电子发射能力不强
C.目前最好的一种不熔化电极的材料
