若采用自然保费，则保费逐年（）。
A.增加
B.减少
C.不变
D.先增加后减少
参考答案：A
实行园长负责制的意义如何？如何理解这一新的领导体制？
The city is very beautiful. There are many trees on ______ sides of streets. [ ]
A. each
B. all
C. both
D. neither
