外国旅游者来华途中丢失行李，可向—索赔
A．境外组团社
B．有关航空公司
C．境内组团社
D．有关保险公司
参考答案：B
The smile on his face makes him ______ really ______. [ ]
A. looks, kind
B. look, kindly
C. to look, kindly
D. look, kind
曲线
的全部渐近线方程是______.
的全部渐近线方程是______.