任何控制都需要一定的费用，这要求有效控制要注意（）A.适时控制 B.适度控制 C.客

阅读理解。

     Football is one of the most popular, interesting and exciting games. Football is popular among tens of

millions of people all over the world.

     I am a football fan. I began to watch football games when the league football match first took place in

China. Then, I became interested in football. In the match, I enjoy the wonderful goal shootings and the

players' courage and endurance (勇气和耐力). The most interesting thing is the result which anyone

can hardly tell.

     The world cup is held every four years. It draws a lot of interest of people all over the world when

teams from different countries begin to fight for the world cup. In the match, many football fans make

friends with one another and know different things of other countries. So football match isn't a simple

match. It's an exchange of culture.

     It is good to support your favourite football team on the sport. To support our national team to fight

for the world cup is the hope of all the Chinese football fans.

1.The writer became interested in the football when the league match was first held _____. [ ]

A. in the United States

B. in Brazil

C. in China

D. in a place not mentioned

2.According to the passage, football is interesting and exciting because of _____. [ ]

A. the wonderful goal shootings

B. an unexpected result

C. the players' courage and endurance

D. all the above

3.The world cup is held _____. [ ]

A. every four years

B. every year

C. every three years

D. every six years

4.What is the writer's point of view about the football match? [ ]

A. A simple match

B. An exchange of culture

C. A match fighting for the world cup

D. I've no idea. 

5. As a Chinese, what do you do during the match of the world cup? [ ]

A. To join the football team.

B. To support the national team to fight for the world cup.

C. To be a football fan like the writer

D. To become a referee (裁判)

关于带电粒子在磁场中的运动，下列说法正确的是[ ]

A、带电粒子飞入匀强磁场后，一定做匀速圆周运动

B、带电粒子飞入匀强磁场后做匀速圆周运动时，速度一定不变

C、带电粒子飞入匀强磁场后做匀速圆周运动时，洛仑兹力的方向总和运动方向垂直

D、带电粒子飞入匀强磁场后做匀速圆周运动时，动能一定保持不变

单位银行账户之间当日累计人民币1000万元以上的转账属于大额交易。 ( )

按防雷要求，500kV铁塔线路，地线对边导线的保护角宜采用( )。

A．0°～5°；
B．5°～10°；
C．10°～15°；
D．15°～20°。

经常保养标准是轨道应经常保持的（）标准。