Of all man’s natural enemies, the one that has caused him more trouble than any other must be the common rat. For centuries, man has been 1 to solve the problem of rats. The ancient Egyptians were probably the first people to try to 2 them with poison, and this method is still being used today. This says a great deal about how 3 this method has been. We have set innumerable 4 , from simple wires to 5 machines that drowned the rats in beer! We have tried to infect (感染) them with 6 developed germs. We’ve 7 tried to raise super cats to kill them. However, we are still losing the 8 .
So why can’t man manage to 9 a mere animal like the rat? The answer is simply that the rat isn’t a ‘mere’ animal; it is a very special kind of animal. An average rat 10 : wriggle through a hole no 11 than a $ 1 coin; climb a brick wall as if it were climbing steps; happily leave a building by being flushed down the toilet, and then return the same 12 ; jump from a fifth storey window and run away 13 ; and last but certainly not least, 14 so rapidly that a single pair could have 15,000 babies in one year!
15 all these physical qualities, we also have the 16 that rats are rather good at not getting caught. They seem to have an almost supernatural ability to 17 when food has been poisoned and a suspicious rat will starve 18 it eats poisoned food. They also seem to be able to 19 a trap with no real difficulty.
One thing looks certain, we had better find a way to 20 these small brown creatures soon, or it may be too late.
1.A.trying B.managing C.coming D.failing
2.A.solve B.drive C.kill D.murder
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4.A.troops B.tricks C.tyres D.traps
5.A.commercial B.complicated C.conventional D.contemporary
6.A.secretly B.especially C.specially D.separately
7.A.ever B.never C.just D.even
8.A.competition B.companion C.battle D.challenge
9.A.overcome B.hunt C.grasp D.interrupt
10.A.should B.can C.must D.may
11.A.larger B.smaller C.less D.more
12.A.method B.way C.means D.road
13.A.harmed B.unharmed C.brave D.clumsy
14.A.adopt B.grow C.multiply D.accelerate
15.A.In spite of B.Owing to C.In addition to D.At the mercy of
16.A.phenomenon B.problem C.principle D.privilege
17.A.touch B.taste C.feel D.sense
18.A.after B.when C.since D.before
19.A.realize B.recognize C.ruin D.rewind
20.A.win B.hit C.strike D.defeat