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问题 选择题

一个直角三角形斜边长为10cm，内切圆半径为1.5cm，则这个三角形周长是（　　）

A．22cm

B．23cm

C．24cm

D．26cm

答案

如图，

设AD=x，则BD=10-x，

∵⊙O是△ABC内切圆，

∴AD=AF=x，BD=BE=10-x，

∵∠C=∠OFC=∠OEC=90°，OE=OF，

∴四边形OECF为正方形，

∴CE=CF=1.5，

∴这个三角形周长2x+2（10-x）+3=23．

故选B．

完形填空

B) 非选择题：阅读下列材料，然后按要求完成所给出的题目。(Read the following three passages. Each passage is followed by several questions. Respond to the questions according to the passage.)

A

Billy: I am usually very hungry by 5:30 when school is over, so I go to the nearest food shop to buy some snacks. Then I go home and do my homework. Because the workload is very heavy, I need four or even five hours to finish it. On weekends, I usually go walking in the park. There is a small mountain in the park and I often do some climbing there. That's on Sunday, but on Saturday I have to spend the day at school.

Grace: I like walking, too. I prefer going to one of the islands on weekends. During the week, like Billy, I need to deal with my lessons. But on Tuesdays I always go swimming at the local indoor pool after school. After that, I meet some friends in TV games center in Star Club. We girls like playing games as much as the boys. I go to the Internet bar to chat with some net friends on Sunday evening. I find it fantastic.

Jenny: I never go to these centers or clubs. Nearly every day I go home on time. I never chat with strangers on the Internet. I never have time for sports. I seldom watch TV at home. The only two things I do at home are studying and sleeping. After a day's work, I always feel tired. One thing I almost forget is that on Sunday evening I go to a restaurant with my parents. In a word, my life is dull and uninteresting.

Questions 51—55：Please fill in the blanks with no more than five words in each blank.
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单项选择题 A1/A2型题

P和Q两个社区年龄调整死亡率相等，P社区组死亡率较Q社区低，则可能得出结论（）。

A.两个社区有相同的年龄分布

B.诊断在P社区较Q社区更不准确

C.诊断在P社区较Q社区更准确

D.P社区较Q社区有更多的年轻人

E.P社区较Q社区有更多的老年人
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