34

　　so rapidly that a single pair could have 15,000 babies in one year!

　　35

　　all these phyical qualities, we also have the

　　36

　　that rats are rather good at not getting caught. They seem to have an almost supernatural ability to

　　37

　　when food has been poisoned and a suspicious rat will starve

　　38

　　it eats poisoned food. They also seem to be able to

　　39

　　a trap with no real difficulty.

　　One thing looks certain, we had better find a way to

　　40

　　these small brown creatures soon, or it may be too late.

　　21. A. Trying

　　B. managing

　　C. coming

　　D. failing

　　22. A. solve

　　B. drive

　　C. kill

　　D. murder

　　23. A. effective

　　B. efficent

　　C. explict

　　D. extreme

　　24. A. troops

　　B. tricks

　　C. tyres

　　D. traps

　　25. A.commercial

　　B. complictated

　　C. conventional

　　D. contemporary

　　26. A. secretly

　　B. especially

　　C. specially

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