某耐火材料的长期使用温度为W，耐火度为X，荷重软化温度为Y，则有( )。

A．W＜X＜Y
B．W＜Y＜X
C．X＜W＜Y
D．Y＜W＜X

Can you give us ______ on how to learn math well?[ ]

A. some advices  

B. some advice  

C. an advice  

D. one advice