健身用的弹簧拉力器，共有四根并接在一起，假如每根伸长1cm要用1N的拉力，则将健

单联省力滑轮组中，承重钢丝绳数为6，其倍率为()。

A、3

B、4

C、5

D、6

阅读理解。

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

     Question: I have been learning English for about 7 years.   1   And I still can't make myself understood in

English. However, I love learning English. How can I learn English well? Please help me.

     Answer: Many people have asked me this question.   2   Here I will give you several tips for learning English.

   3   

     First of all, you must want to learn. If you are not interested in learning English, no class will help you and

no book will help you. So you have to be honest with yourself. Ask yourself, "Do I really want to learn

English?" If you can't answer "yes" to this question, it is better for you to set English aside until you're ready

and willing to learn.

     Set goals(目标)

     To learn English well, you must set some goals.   4   It will also help you to see your progress. Ask

yourself,"What are my goals? What areas would I like to improve?" Think about what your goals are, and

review once in a while to see that you are making progress toward your goals.

      Practice, practice, and practice.

     After you have set your goals, you have a better idea of what you need to practice. Just like the athlete

whose goal is the Olympics must train daily, you as a language leaner must practise language every day to

make progress toward your goal.   5   

A. Want to learn.

B. I think it is not easy to learn it well.

C. Make friends with some Americans online.

D. Reading is a very good way to learn new words.

E. The answers are as different as the people asking the question.

F. The more you practise, the more progress you will make.

G. Having goals will help you remember what areas you want to work on.

两根梁长度、截面形状和约束条什完全相同，一根材料为钢，另一根为铝。在相同的外力作用下发生弯曲形变，二者不同之处为：

A．弯曲内力

B．弯曲正应力

C．弯曲切应力

D．挠曲线

患者，女。动物饲养员，肝区隐痛、食欲缺乏1个月余，查体触诊肝脏饱满，实验室检查白细胞略增高，CT平扫见肝脏多个囊性低密度病灶，大小不一，边界清晰，部分病灶其内可见钙化。

若出现以下哪种影像学征象，对诊断肝棘球蚴囊肿有极大帮助（）

A.囊肿直径大于5cm

B.注射造影剂后病灶明显强化

C.肝门区见多个肿大淋巴结

D.母囊内可见子囊

E.以上都不是

从哲学上看，建立农村集体经营性建设用地产权流转和增值收益分配制度的依据是（）

A.上层建筑要适应经济基础发展要求

B.制度创新是社会发展和变革的先导

C.社会意识是对社会存在的正确反映

D.生产关系一定要适应生产力的状况