单项选择题

酰化剂的烃基中有芳基取代时，可以发生分子内的酰化得到环酮，其反应难易与形成环的大小有关下列排列顺序正确的是（）

A．六元环＞七元环＞五元环
B．六元环＞五元环＞七元环
C．五元环＞七元环＞六元环
D．七元环＞六元环＞五元环

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多项选择题

What are the duties for the local guide when the tour group arrives at the hotel? A.
Help the tour escort check in for the tour group. B.
Introduce the facilities in the hotel. C.
Arrange the morning call for the next morning. D.
Announce the itinerary of the next day. E.
Show the tourists to the restaurant when they have their first meal. F.
Solve the problems happened in the tourists’ room. G.
Sleep in the hotel with the tourists.

不定项选择

中国的京剧有大概500多年的历史。（）

A．正确
B．错误