— Have you got any oranges and apples?

— ____ 

A．Yes， madam， on the second shelf over there.

B．The oranges are very cheap.

C．You like apples， don't you?

D．Of course， we have some fruits.

下列物质是由分子构成的是（　　）

A．二氧化碳

B．金刚石

C．铁

D．氯化钠