依法治税的基本含义是（）。
A、有法可依
B、有法必依
C、执法必严
D、违法必究
参考答案：A, B, C, D
—What can we do to improve the environment of Beijing?
—More and more trees _______, I think. [ ]
A. must be planted
B. must planted
C. must be plant
D. must plant
商业信用的形式归纳起来有( )两大类。
A．(A) 赊购
B．(B) 赊销
C．(C) 预付
D．(D) 预收
