There is a lot of water on the e ,but we cannot use mof it. About 97.4% of the earth's water is s, We can't drink it. Most of the fresh water is snow and ice near the North and South poles.
We can use only about one percent of the water on the earth. We use water from both lakes and r. Some of the water evaporates (蒸发)and then becomes r. Of course we use rain water for farms and other things. We use this water aand again. That's what we call wcycle(循环).
⑴Please stand in line. A. Okay.
⑵Do you always ride bikes? B. Sometimes.
⑶Has your father got a basketball? C. I had a picnic.
⑷Whose pen is it? D. No, he hasn't.
⑸What did you do at the weekend? E. It's my friend's.
(先填出油率,再填出油重量)