1. 关于闭合电路，下列说法中正确的是(　)

A.闭合电路中，电流总是从电势高的地方流向电势低的地方　

B.闭合电路中，电源的路端电压越大，电源的输出功率就越大　

C.闭合电路中，电流越大，电源的路端电压就越大　

D.闭合电路中，外电阻越大，电源的路端电压就越大　

26. Autumn is ______ season in a year. It is called “fall” in American English. (09凉山州)

　 A. three　　　 B. the third　　　 C. a third

答案：B

25. Nowadays ______ of business letters are written in English. (09潍坊)

　 A. two third　　　 B. two thirds　　　 C. two three　　　 D. second three

答案：B

24. ---Where does John live?

　 ---He lives on ______ floor but he doesn’t use a lift to go up and down.(09朝阳)

　 A. nine　　　 B. the ninth　　　 C. ninth　　　 D. a ninth

答案：B

23. We are going to hold a big party to celebrate _____ birthday of new China.(09株洲)

　 A. the sixtieth　　 B. sixty　　　 C. sixtieth

答案：A

22. Father’s Day is on _______ Sunday of June. (09长沙)

　 A. three　　　 B. third　　　 C. the third

答案：C

21. On the first day of October 2009, our great country will have its ____ birthday. (09咸宁)

　 A. sixty　　　 B. sixties　　 C. sixtieth　　 D. the sixtieth

答案：C

20. --- Which is the biggest number of the four?

　 ---____________. (09咸宁)

　 A. Two-thirds　　　 B. A half　　 C. A quarter　　 D. One-third

答案：A

19. The important sports festival, the Olympic Games, _____ held every _____ years.(09咸宁)

A. is, five　　 B. are, three　　 C. is, four　　 D. are, two

答案：C