园林工人要在周长300m的圆形花坛边等距离地栽上树．他们先沿着花坛的边每隔3m挖一坑，当挖完30个坑时，突然接到通知：改为每隔5m栽一棵树．这样，他们还要挖( )个坑才能完成任务．
A．(A) 55
B．(B) 54
C．(C) 53
D．(D) 52
参考答案：B
解析： 显然原来每隔15m处挖的坑还可以使用，90m中这样的坑有6个，在这90m中还需要挖12个；总共剩下210m，这样需要挖42个，故还需要挖54个，选(B)．
完形填空（20 分） 阅读下面短文，掌握其大意，然后从下列各题所给的A、B、C和D四个选项中，选出最佳选项。 Many people of my generation(代，一代) say that there is no hope for the future because of the way that 11 people behave today. Their first argument（论点） is that when we were young we used to look after the 12 people in our community and help them. They also say that young people today don’t 13 about anything or anyone. However, I think the reason why we looked after older people was that we had no 14 . People had to live with their 15 and grandparents because they had no money. Young people today earn more and have more 16 to live where they want. Their second argument is that in our day we didn’t expect （盼望，期待）to be given jobs -----and that young people now don’t look for jobs, but just complain（抱怨） about 17 . On the other hand, things were easier in the past and it was always easy to get a job if you had friends and contacts（关系）. It is really 18 today. In conclusion I think there is hope for the 19 . This generation, like generations before them, has new 20 as well as old problems. If they learn from our mistakes the world will be a better place in future.
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