问题 不定项选择

如图,在一水平放置的平板MN的上方有匀强磁场,磁感应强度的大小为B,磁场方向垂直于纸面向里。许多质量为m带电量为+q的粒子,以相同的速率v沿位于纸面内的各个方向,由小孔O射入磁场区域。不计重力,不计粒子间的相互影响。下列图中阴影部分表示带电粒子可能经过的区域,其中。哪个图是正确的

[ ]

A.

B.

C.

D.

答案

答案:A

阅读理解

阅读理解。

     Canberra is the capital of Australia. It is a modern and lively city with a population of over 345.000. 

                                                                     History

     Canberra is the eighth largest city in Australia. It is 238 km from Sydney and 507 km from Melbourne

was once the capital of Austualia. Sydney people also wished to make their city the capital. It was difficult

for the government to make the decision. Then in 1911, the government chose a place to build the new

capital. It was between Sydney and Melbourne, the two largest cities. In 1927, the city was set up. It became

the capital and was named Canberra. "Canberra" means "a place for friends to get together."

                                                                      Cuture

     Canberra is a beautiful city with trees and flowers everywhere. There's a Flower Festival in September

each year. People can enjoy all kinds of beautiful flowers and welcome the spring to arrive. A man-made

like-lake. Bertey Griffin is in the center of the city. It's about 25 km long. People like to ride bikes, walk or

run around the lake. In Canberra, there're many famous universities like the Australian National University

and the University of Canberra. The National Library and the National Meseum of Australia are also famous

places that people like to visit.

1. How far is Canberra from Sydney?

A. 25km

B. 238km

C. 345 km

D. 507 km

2. The word "Canberra"means _____.

A. the largest city

B. a beautiful man-made lake

C. the old capital city

D. a place for friends to get together

3. Canberra Flower Festival is a festival _____.

A. ride lakes

B. visit Universities

C. welcome the spring

D. walk around the lake

单项选择题