|
|
|
|
| |
《新概念第四册 - 38 Lrc歌词》 |
| |
|
╔---------－--------------------SUPERLYRICS---╗
｜九九Lrc歌词网免费提供Lrc歌词搜索、Lrc歌词下载｜
｜ 感谢你推荐www.99Lrc.net给你的好友使用 ｜
╚----------－----------------------------.NET-╝
歌曲名：Unknown
歌手名：jgjh
专辑名：hgjjhjj
感谢｛hjgkjg｝辛苦编辑Lrc歌词，并提供给大家分享
Lesson 38 Water and the traveler
First listen and then answer the following question.
What does this text describe?
Contamination of water supp-lies
is usually due to poor sanit-ation close to water sources,
sewage disposal into the sources themselves,
leakage of sewage into distribution systems
or contamination with industrial or farm waste.
Even if a piped water supply is safe at its source,
it is not always safe by the time it reaches the tap.
Intermittent tap-water supplies should be regarded
as particularly suspect.Trave-llers on short trips to areas
with water supp-lies of uncert-ain quality
should avoid dr-inking tap-water,
or untreated water from any other source.
It is best to keep to hot drinks,
bottled or canned drinks of well-known brand names-
international standards of water treatment
are usually followed at bottling plants.
Carbonated drinks are acidic, and slightly safer.
Make sure that all bottles are opened in your presence,
and That their rims are clean and dry.
Boiling is always a good way of treating water.
Some hotels sup-ply boiled water on request
and this can be used for drinking, or for brushing teeth.
Portable boiling elements
that can boil small quantities of water
are useful when the right volta-ge of electrici-ty is available.
Refuse politely any cold drink from an unknown source.
Ice is only as safe as the water from which it is made,
and should not be put in drinks
unless it is known to be safe.
Drinks can be cooled by placing them on ice
rather than adding ice to them.
Alcohol may be a medical disinfectant,
but should not be relied upon to sterilize water.
Ethanol is more effective at a concentration of
50-70 per cent; below 20 per cent,
its bacterici-dal action is negligible.
Spirits labeled 95 proof contain only about 47 per cent alcohol.
Beware of meth-ylated alcohol, which is very poisonous,
and should never be added to drinking water.
If no other safe water supply can be obtained,
tap water that is too hot to touch can be left to cool
and is general-ly safe to drink.
Those planning a trip to remote areas,
or intending to live in countr-ies where drin-king water
is not readily available,
should know ab-out the various possible methods
for making water safe.
|
|
|
| | |
『新概念第四册 - 38 Lrc歌词下载』
『新概念第四册 - 38 歌曲在线试听、MP3下载』