法律赋予企业的商标权都具有时效性，我国《商标法》规定注册商标的有效期为（）年。
A.5
B.10
C.15
D.20
参考答案：B
根据句意及首字母填空。
1. I like English, because I think it is very i______.
2. Tennis and volleyball are s______.
3. It's d______ for me to write a letter in English.
4. She likes going shopping with her f______, because her parents are busy.
5. —Does Jane like going to the m______? —Yes,she wants to be an actor.
下列不属于资产类科目的是( )。
A．预付账款B．坏账准备C．累计折旧D．预收账款
