A:素炒芹菜
B:牛奶
C:小米粥
D:排骨汤
—How long have you ________ the basketball team of the school?
—For about two years.
水是人类的宝贵资源,但水被污染后给人类带来灾难.____ 、____
____ 是造成水体污染的主要原因.