26. I have seldom seen my mother _______ pleased with my progress as she is now .

A. so　　 B. very　　 C. too　　 D. rather

25. Mary made coffee ________ her guests　 were　 finishing their meal .

A. so that　 B. although　 C. while D. as if

24. As a child , Jack studied in a village school ,_____ is named after his grandfather.

A. which　 B. where　　 C. what 　　D. that

23. I’ll spend half of my holiday practicing English and _______ half learning drawing.

A. another　 B. the　 other　 C. other’s　 D. other

22. The workers ______ the glasses and marked on each box　 “ This Side Up”

A. carried　 B. delivered　　 C. pressed　 D. packed

第一节　 单项填空(共15小题；每小题1分，满分15分)

从A.B.C.D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。

例：We ______ last night ,but we went to the concert instead.

A. must have studied　　　 B. might study

C. should have studied　　 D. would study

答案是C

21. -Have you finished reading Jane Eyre?

-No , I ______ my homework all day yesterday.

A. was doing　　　 B. would do　　　 C. has done　　 D. do

9．电子体重秤的原理如图22所示，R0为定值电阻，R是电阻值随所受压力大小发生变化的可变电阻，更换电压表(量程为3V)的表盘后可直接显示人体质量大小。已知R的电阻与所受压力F变化的关系如图象所示。设踏板的质量忽略不计，电源电压保持9V不变，g =10N/kg。

　 (1)空载时，电压表的示数为1V，求R0的电阻值。

　 (2)该体重秤的量程是多大？

(3)如果保持体重秤结构和电压表量程不变，只在电路中增加一个电阻，使体重秤的量程增大到110 kg。计算说明应使用多大的电阻？如何连接？

(4) 改装后的体重秤电路总功率变化范围是多大?

8.如图甲所示的滑轮组，每个滑轮等重。不计绳重和摩擦，物体重从200N开始逐渐增加，直到绳子被拉断。每次均匀速拉动绳子将物体提升同样的高度。图乙记录了在此过程中滑轮组的机械效率随物体重力的增加而变化的图像。

(1) 每个滑轮重多少?

(2) 绳子能承受的最大拉力是多少N?

(3) 当滑轮组的机械效率为80%时，物体重多少N?

(4)提高机械效率，除了增加物重之外，还可以通过什么方式？