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
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
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
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
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:
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
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?
9.用条件语句描述下面的算法流程图.
解
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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