The swimming pool is ______ once a week and filled with fresh water.
A: drained
B: pierced
C: pinched
D: stooped
A: drained
B: pierced
C: pinched
D: stooped
举一反三
- Only 3 percent of the world’s water is fresh water. The rest _______ salt water. A: be B: am C: is D: are
- 32.Less than _______of water on earth is fresh water. A: 3% B: 4% C: 5% D: 6%
- Under the same conditions, fresh water evaporates faster than sea water.
- Fresh water ________ at a higher temperature than salt water. A: melts B: concentrates C: freezes D: resolves
- Under the same conditions, fresh water evaporates faster than sea water. A: 正确 B: 错误