例题讲解
How does water scarcity affect people? First of all，it 41 their health．It is not that they will die of thirst；rather，the poor quality of the water  42   for cooking and drinking may make them ill．

43 our bodies require water to treat waste products，plentiful water is required for proper sanitation (卫生) —water that for much of mankind is simply not available． 44 people without adequate sanitation rose from 2.6 billion in 1990 to 2.9 billion in 1999．And sanitation is literally a matter of life and death．In a   45  statement，United Nations officials warned：“When children lack water that is fit for drinking and sanitation，virtually every aspect of their health and development is   46 ．”

 Food production is dependent on water．Many crops，of course，are watered by rain，but in recent times irrigation has become the key： 47  the world’s booming population．Today 36 percent of the world’s harvest depends on irrigation．

If plentiful water flows out of every tap in our home and if we have a clean toilet(抽水马桶)that conveniently washes out waste，it may be  48 to believe that the world is running out of an adequate supply of water．We should remember，however，that only 20 percent of mankind enjoy such   49 ．In Africa many women spend as much as six hours a day   50  water．

41．A．hurts             B．harms            C．injures           D．destroys

42．A．valuable        B．desirable       C．capable          D．available

43．A．As for            B．As well as      C．Just as           D．Such as

44．A．The number of  B．A number of    C．Numbers of    D．Numerous

45．A．joining           B．joined            C．join                D．joint

46．A．at a loss        B．at a11 costs   C．at worst        D．at risk

47．A．to feed          B．to feeding      C．for feed          D．for feeding

48．A．hard              B．easy              C．sure               D．usual

49．A．decorations  B．luxuries          C．wastes          D．recreations

50．A．bringing        B．taking            C．fetching         D．carrying

Visitors to this country are normally admitted for six months, but foreign students can usually stay for one year. They must 56  an educational institution, and they are required to study for a 57