题目内容
see and feel water coming from the atmosphere when we have rain. But the water must somehow get back
to the atmosphere. Meteorologists call this the water cycle.
There are many stages in the water cycle. Rain falls when water vapour in clouds condenses(凝结).
Drops of water form and fall to the ground. The water soaks into the ground and feeds streams and rivers.
A lot of rain falls into the sea. The heat of the sun evaporates some of the water in the ground and in the
rivers, lakes, and the sea. It changes the liquid water into water vapour. The vapour rises onto the air.
Water vapour is normally invisible. On a very damp or humid day, however, you can sometimes see
water v
gets into the air from living things. Trees and other plants take in water throug
water vapour from their leaves. People and land animals drink water and breathe out water vapour. In all
these ways the water returns to the air. There it gathers to form clouds and condenses to form rain. The
rain falls to earth, and the cycle starts again. It continues even if snow or hail(冰雹) fall instead because
both eventually melt t
The air is more moist(潮湿) in the tropics(热带) than in the cold polar regions.
B. Water vapour.
C. How rain forms.
D. Water, vapour, rain.
B. Three.
C. Four.
D. Five.
B. how good your eyes are
C. in which way water is evaporated
D. climate or weather
B. there is more water vapour in the air in cold polar region than in the tropics
C. it gets more rain in the tropics than in cold polar regions because there is less vapour
D. the amount of water vapour in the air depends on how often it rains
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||