As rain begins to fall from the clouds, it is very pure. How
来源:学生作业帮 编辑:作业帮 分类:英语作业 时间:2024/10/06 22:06:33
As rain begins to fall from the clouds, it is very pure. However, as it falls through the air it dissolves some of the gases in the air ,It also collects bits of dust and microbes(微生物)that are floating in the air, When the rain reaches the ground it begins to pick up more dust and dirt, Many kinds of mineral substances dissolve in the water ,Sand and nud cannot dissolve in water. Since water is so important to us, it is very important that the water we use should be clean , Otherwise, we might get some of the diseases that are carried by water Many microbes are harmful ,They are so small that we cannot see them ,These microbes must be removed or killed before the water is not clean, people who drink this water may get these diseases, Thus , to provide people with clean water, the government purifies the water. Purification is a long process and consists of three stages: storing ,purifying and distributing ,The first stage is storing , Man-made lakes called reservoirs are used for this purpose ,Water from the rains ,other lakes, streams and rivers is collected in the reservoirs ,This water is usually dirty and muddy. In the second stage shich is purifying , water from the reservoirs is filtered in a special pond, Stones, sand and other unwanted tiny things are caught in it, After that, tiny microbes are still present in the water ,These microbes are removed by “airing ”the water and by adding a chemical substance called chloring(氯)to the water ,This kills all the microbes in the water ,A fter this the water can be safely used for drinking. The third stage is the distribution of the purified water to homes ,hospitals, offices ,factories and other places, This is done through a network of pipes of various sizes, These pipes must be make of a suitable material. 小题1:From Paragraph 1, we can learn that
|
小题1:C
小题2:B
小题3:D
小题4:C
小题5:C
When the Rain Begins to Fall 歌词
翻译英语1.Water falls from the clouds as rain.2.It runs into str
It is going to rain soon,as there are dark clouds _________
It is going to rain soon,as there are dark clouds ___our hea
look at the clouds.it()soon.A.is raining B.is to rain C.will
The black clouds have _____ the sun and it is going to rain.
Look at the clouds.It___that it is going to rain.A.seems B.l
Look at the clouds,It ( )rain.A.will B.is going to C.must D.
See the clouds!It() rain A.will B.is going to C.must D.may
Look at the black clouds,it( )rain.A.will B.is going to
英语翻译What makes it rain?Rain falls from clouds for the same r
the weather s as if it is going to rain