餐厅内切忌选用（），因其化学成分高，长期使用会污染空气。
A.鲜花
B.塑料花
C.干鲜花
D.绢花
参考答案：B
— Can I pay the bill by check?
— Sorry, sir. But it is the management rule of our hotel that payment ________ be made in cash.[ ]
A. shall
B. need
C. will
D. can
《全国文明城市测评体系》对城市人均公共绿地的最低测评标准是多少？
