在水的循环过程中evaporation, condensation 和 precipitation都具体指哪一过程？transpiration又代表什么呢？
The water cycle is an exciting and continuous process. The water cycle is the movement of water in the environment by evaporation,condensation, and precipitation. The warm sun causes water on the earth to evaporate(to change a liquid into a gas)and rise up into the sky. The water vapors that are formed, cool during evaporation. This is what forms clouds that float in the sky. Clouds can be a mass of water droplets(小滴) or ice particles. When the clouds get heavy enough, the water falls back to the earth. Condensation is the change of a gas, such as water vapors, into a liquid or solid. The water vapors must turn into a liquid or solid before it can fall to the earth. When the water falls back to the earth it is called precipitation. The water may fall as rain, snow, or hail(冰雹). Plants in our environment also release water vapor into the atmosphere. When plants do this it is called transpiration(蒸发).
1. What causes the water on the earth to evaporate and rise?
A. The earth. B. The sun.
C. Umbrellas.
D. None of the above.
2. Clouds are formed by________.
A. water vapors B. rainbow
C. summer D. helium(氦)
3. Which one is NOT part of the water cycle's movement of water?
A. precipitation B. transpiration C. transportation
D. condensation
4. Which is TRUE about clouds?
A. They can be ice particles.
B. They are made of water droplets.
C. When they get heavy enough water falls back to the earth.
D. All of the above.
5. The process by which plants transfer vapor into the atmosphere is called________.
A. condensation B. evaporation
C. transpiration D. precipitation
参考答案：
1.B 2.A 3.C 4.D 5.C
