我国淡水面积大约为66 000千米2，用科学记数法表示为______千米2．
66 000=6.6×104千米2．
— What's he wearing?
— ___________________[ ]
A. He's wearing a green shirt.
B. I am wearing a green shirt.
C. She's wearing a green blouse.
当石灰岩中含有粘土矿物时就应命名为含泥灰岩。（）
