小玲制作一个圆锥模型，这个模型的侧面是一个半径为9cm，圆心角_爱下问搜题

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问题填空题

小玲制作一个圆锥模型，这个模型的侧面是一个半径为9cm，圆心角为120°的扇形铁皮制作的，再用一块圆铁片做底，则这块圆铁片的半径为______cm．

答案

设此圆锥的底面半径为r，根据圆锥的侧面展开图扇形的弧长等于圆锥底面周长可得2πr=

120π•9

180

，r=3cm．

完形填空

"Where is the university(大学)?"This is a question that many visitors to Cambridge(剑桥)ask. But no one can give them a 36  answer, for there is no wall to be found 37 the university. The university is the city. You can find classroom buildings, 38 , museums and offices of the university all over the city. And most of its members are the students and 39 of the thirty-one colleges (学院). .
Cambridge was already a   40 town long before the first students and teachers arrived 800 years ago. It grew up by the river Granta, and the river was once 41 the Cam. A 42 was built over the river as early as 875. So the town got its name "Cambridge".
In the fourteenth and fifteenth centuries more and more land was used for college buildings. The town grew much 43 in the nineteenth century after the opening of the railway in 1845. Cambridge became a 44 in 1951 and now it has a population of over 100, 000. Many young students in other countries   45  to study at Cambridge. Thousands of people from all over the world come to visit the university town. It has become a famous place all around the world.

A．interesting

单项选择题

以下正确的程序段是______。

A．int*p； scanf("%d"，；

B．int *s,k *s=100；

C．int*s，k；char*p，c； s=&k； p=&c； *p='a';

D．int*s，k；char*p，c；s=&k；p=&c；s=p；*s=1；