地球上陆地和海洋的面积比例是[ ]
A、4∶6
B、3∶7
C、2∶8
D、1∶1
答案：B
— Do you have T-shirts?— Yes, I do.— Do you have a dress?— No, I don't. But I have a skirt.— Do you have any shorts? — No, I don't. But I have some jeans.— Do you have any shoes?— Yes, and some socks.
一本数学书的体积约是117[ ]
A．立方米
B．立方厘米
C．立方分米
D．升
