患者，女，40岁，工人。搬物扭伤腰后突发腰痛及放射性右股前下、膝前小腿前内侧疼痛2年

用适当的词或短语完成下面两篇短文。使文章意思连贯，语句通顺。

                                                                    A

     Jamie was a boy. He didn't have a hobby. After school, he didn't 1.            in any games with his

friends. He just 2.            at home and 3.            a lot of television. No hobby was not a good way for

a young boy to 4.            up. So one day his grandpa knew it and came to his home. He taught him

how to fish. Jamie was very happy and had a lot of fun doing this. From the story we know hobby is

a great joy. 

                                                                   B

     Boys and girls, the winter holiday is 5           . By 6           , what plans have you 7.            for it?

8.            your hobbies? Let's do the things we like to do. Come on, boys and girls. I'm very sure you'll

enjoy 9           . But remember to bring your schoolworks to your teacher before you 10.            to

school.

英国著名历史学家尼尔·弗格森在《文明》中写道：“到了20世纪70年代，牛仔裤已经成为世界上最流行的服装……为什么苏联人不能像仿制原子弹那样仿制‘李维斯501’系列牛仔裤呢？”对这一问题的解释，最合理的是

A．体制束缚导致技术落后

B．“冷战”和意识形态的影响

C．苏联人不喜欢牛仔裤

D．美国封锁牛仔裤生产技术

当电压低于某一数值而动作的保护叫失压保护。（）

在计算机领域中，所谓“裸机”是指( )。

A．单片机

B．单板机

C．不安装任何软件的计算机

D．只安装操作系统的计算机

对于一个静定桁架结构，如果其中一根杆元件的横截面面积增大一倍，其它条件不变，则这根杆元件的内力（）。

A.增大

B.不变

C.减小

D.无法确定，不同的结构有不同的结果