D.director’s
18.A.netted
B.spent
C.owed
D.lost
19.A.fitted
B.contained
C.presented
D.won
20.A.maker
B.star
C.promoter
D.sponsor
——————————————————————————————————————.任务型阅读
Canada is a land with abundant fresh water.In the past it may have seemed that the fresh water resources were limitless.Over time,however,water pollution has damaged this resource.
There are three main types of water pollution:physical,biological,and chemical.Perhaps the least harmful but most obvious form of pollution is the physical variety.Floating garbage,old tires,pieces of paper,pop cans and bottles are not pleasant to look at.But this pollution is easily seen and its clean-up and prevention are relatively simple.
Biological contamination refers to bacteria and algae that enter lakes and rivers from a variety of sources.Waste water from cities and towns is the largest source of biological contamination.While most waste water is treated,not all treatment is adequate.Some enters water bodies without any treatment at all.
Some bacteria that occur naturally in rivers and lakes are able to cleanse biological pollution from the water over time.Human beings are,however,overloading many water bodies to the point where there is too much waste for the natural purification process to be effective.
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