Water is very important to us.We cannot live without it.

Water is very important to us.We cannot live without it.
There is a lot of water on the earth,but we cannot use most of it.About 97.4% of the earth’s water is salty（咸的）.Most of the fresh（淡的）water is snow and ice near the North and South Poles（极）.
We can use only about one percent of the water on the earth.We use water from both lakes and rivers.Some of the water evaporates（蒸发）and then becomes rain.Of course we use rain water for farms and other things.We use this water again and again.
Sometimes the earth’s water is in the wrong place.There is a lot of rain in the tropics（热带地区）,but it is difficult to have farms in the tropics.Most of the land there is not very rich.Some desert land is rich,but there is only a little water in the desert.
Water is a problem for many people in the world.
Choose the best answer according to the passage (根据短文内容,选择最恰当的答案)：
（ ）1.About of the earth’s water is fresh.
A.97.4% B.2.6% C.1% D.25%
（ ）2.Most of the fresh water is .
A.snow and ice B.rain
C.in lakes and rivers D.in oceans
（ ）3.It rains after the water from oceans,lakes and rivers.
A.falls B.enjoys C.evaporates D.runs
（ ）4.We only use of the earth’s fresh water.
A.50% B.97.4% C.25% D.2.6%
（ ）5.Most of the land in the tropics is .
A.poor B.dry C.rich D.salty