There are many countries in the world where the water supply is not sufficient for the growing population, and other sources have to be found. Even the sea is used in some countries, but the problem of removing the salt is a severe one. Sea water can be used for a supply of drinkable water if it can be separated from the salt dissolved in it.
Cars are responsible for most of the smog in cities，______(这已经对环境造成了严重的污染)．
增长知识()搜集个人生活所需的信息
The program aimed at creating a single, federated sign-on system is called ______.
Exposure to all media is important because they all contribute materials for ______.
TASK TWO—DISADVANTAGE
&8226;For questions 18—22, match the extracts with the disadvantages, listed A—H.
&8226;For each extract, choose the disadvantage stated.
&8226;Write one letter (A—H) next to the number of the extract.
A Unlimited liability
B Short length of life
C Limited source of funds
D Difficulties in withdrawing
E Unfair profit-sharing for new partners
F Limited management
G Limited employee skills
H Owner conflict