0  396999  397007  397013  397017  397023  397025  397029  397035  397037  397043  397049  397053  397055  397059  397065  397067  397073  397077  397079  397083  397085  397089  397091  397093  397094  397095  397097  397098  397099  397101  397103  397107  397109  397113  397115  397119  397125  397127  397133  397137  397139  397143  397149  397155  397157  397163  397167  397169  397175  397179  397185  397193  447090 

18. The conference has been held to discuss the effects of tourism ______ the wildlife in the area.

A. to             B. on              C. at               D. with

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17. We needed a new cupboard for the kitchen. So Peter made ________ from some wood we had.

A. it             B. one              C. himself            D. another

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16. Eco-travel is a form of travel that ______ normal tourism with learning and it is more environmentally-friendly.

A. exchanges       B. shares            C. combines         D. matches

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从各题A、B、C、D四个选项中,选出可以填入空白处的最佳答案。

15. Believing that everyone can make _____ world _____ better place on a daily basis, Tom plays his part in protecting the environment.

A. /, a            B. the, /             C. the, a            D. the, the

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12.一个小朋友在一次玩皮球时,偶然发现一个现象:球从某高度落下后,每次都反弹回原高度的,再落下,再反弹回上次高度的,如此反复.假设球从100 cm处落下,那么第10次下落的高度是多少?在第10次落地时共经过多少路程?试用伪代码表示其算法.

解  伪代码如图所示:

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11.有一个算法如下:

S1  输入x;

S2  判断x>0

是:z←1;否:z←-1;

S3  z←1+z;

S4  输出z.

试写出上述算法的流程图及相应的伪代码.

解 

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10.请设计一个问题,使得该问题的算法如已知的伪代码所示.

解  已知圆O内有一个边长为a的圆的内接正方形,求圆的面积比正方形的面积大多少?

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9.用条件语句描述下面的算法流程图.

             

Read  x

If  x<0  Then

y←2×x+3

Else

If  x>0  Then

y←2×x-5

Else

y←0

End  If

End  If

Print  y

End

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