Cloze Test(20 points)

　　Directions：There are 10 blanks in the following passage.For each blank there are four choices marked A，B，C and D.You should choose the one answer that best fits into the passage.Then mark the corresponding letter on the Answer Sheet with a single line through the center.

　　21、 根据以下内容回答21-40题：

　　Research has shown that excessive noise(1)people’S hearing.In fact，many young people now suffer from deafness from regularly going to discos where the(2)of noise is so high that they have to shout to make themselves(3).Unfortunately，in spite of modem(4)，noise is a very much part of our modem world.Planes flying overhead，traffic thundering along busy roads，television，portable radios，all produce noise(5)which we have become so accustomed that we hardly(6)it.In fact，people going on country holidays have been known to complain that it is too quiet，they actually miss the noises they are used to in their daily lives.The problem is that noise，though it does not necessarily cause deafness，causes(7)and this can(8)the long run prove harmful.(9)，the decision about more or less noise cannot be left to the scientists alone.It is(10)to us to decide what kind of world we want to live in.

　　请回答(1)题

　　A.spoils

　　B.damagest

　　C.ruins

　　D.destroys

　　22、 请回答(2)题

　　A.amount

　　B.rate

　　C.level

　　D.standard

　　23、 请回答(3)题

　　A.noticed

　　B.known

　　C.heard

　　D.found