干性皮肤的特点（）A.易长粉刺、易留疤痕 B.皮肤薄而多小皱纹 C.肤色均匀、毛

设x，y∈R，且满足x²+y²=1，则x+y的最大值为______．

试论中西文艺心理学的对话与交融的意义.

She was complaining that the doctor was________too much for the treatment he was giving her.[ ]

A. spending  

B. offering

C. costing  

D. charging

( )是民族区域自治制度的核心。

A．自治机关
B．实行特殊政策
C．自治权
D．民族自治和区域自治的结合