问题 问答题

如图所示为一个反射式路灯,S为灯泡位置,图中已画出灯泡射出的两条最边缘的出射光线.MN是一个可以调节倾斜程度的平面镜.请在图中画出灯S照亮路面的范围(保留作图中必要的辅助线),请提出一种能够增大灯照亮范围的方法______.

答案

从作图的过程中,可以发现当减小灯与平面镜的距离或改变平面镜的倾斜程度时,都可以增大灯照亮范围.

故本题答案为:减小灯与平面镜的距离(或改变平面镜的倾斜度等).

单项选择题
阅读理解

(1) SECRETARY. Part time. 20 hours a week. Busy doctor`s office. Experience preferred. Good typing. Call 555-2438.

(2) BABY SITTER. 3 to 6 weekday afternoons. I will take you home. $5.00 an hour. Call 555-5593

(3) GUITAR LESSONS. Your home or mine. Experienced musician. Master`s degree in music. Call Louise 555-6131.

(4) TENTH STREET BLOCK PARTY. Sunday, July 15. Noon to 8. Food, games, prizes, live band, Tenth Street between Main and North.

(5) APARTMENT FOR RENT. 3 sunny rooms on high floor, great view. Separate kitchen. Wall-to-wall carpeting. The living room can be used as dining room. Email: SDGT@163.com.cn.

(6) TAXI DRIVER WANTED. Full or part time. Experience necessary. A good knowledge of the city is required. Call 555-8860 between 9 a. m. and 5 p. m. weekday.

(7) A STEREO SYSTEM FOR SALE. It has two speakers. The system has an AM/FM radio. It also has a tape deck and turntable. It is in good condition. The stereo was owned for only one year. The price is $200 including the speakers. The owner will also take the highest price offered if the asking price is not met. Call Bill after 6 p. m. at 555-9834.

小题1:Which of the following is true according to the ads above?

A.The tenth street block party will last until after 8.

B.The owner of the stereo will never sell his stereo at a price less than $200.

C.The taxi driver is not necessarily familiar with the city.

D.Those who have some experience in office work will have a better chance to get the job of secretary.小题2:We may learn from the ads above that ______.

A.a baby sitter is paid by the hour.

B.the party will be held without any music

C.the rooms for rent cannot get good sunlight

D.people can get guitar lessons at any places they like小题3:These ads may probably appear in the following media except _____.

A.a local newspaper

B.a page on the internet

C.a government report

D.a special radio program