问题 填空题

彩虹是太阳光传播中被空中水滴______而产生的,电视画面的颜色是由______三种色光合成的.

答案

当太阳光射入雨后空气中的小水滴时,太阳光经过折射发生色散,从而形成彩虹;

而彩色电视机荧屏上呈现各种颜色是由红绿蓝三色色光合成的.

故答案为:色散;红、绿、蓝.

单项选择题
阅读理解

阅读理解。

     Yang Yang( A) Wins China' s First-ever Winter Olympic Gold

     Five-time world overall short-track speed skating champion Yang Yang( A) won China' s first-ever Winter

Olympic gold medal with a runaway victory in the 500m final on Saturday.

     Yang Yang, putting behind her a dismal fourth place finish in the 1,500 meters three days ago, got off to a

sparking lead and never looked back to cross the line in 44. 187 seconds. World-record holder and four-time

European champion Evgenia Radanova followed her 0.065 seconds behind.

     Another Chinese, Wang Chunju, the world champion in the shortest distance came in third, two-hundredths

of second further behind.

     Yang,25,whose name is tagged with the letter A to distinguish her from her younger teammate and

namesake, Yang Yang ( S),is the overall World Cup winner in this season, with the top points in the 1,000m

and 1,500m.

     In the 1,500m, the younger Yang,24, who won two silver medals in Nagano four years ago, crashed out

while chasing hard after two South Korean teenagers, Ko Gi-Hyun and Choi Eun-Kyung, who eventually

finished first and second. Yang Yang( A) ended up fourth.

     Yang Yang( S) did not compete in the 500 meters.

1. What day was the day when Yang Yang ( A) competed in the 1,500 meters?

A. Saturday.

B. Friday.

C. Thursday.

D. Wednesday.

2. How long did Evgenia Radanova take to finish the 500m final?

A. 44. 252 seconds.

B. 44. 187 seconds.

C. 44.122 seconds.

D. None of the above.

3. Why did not Yang Yang( S) compete in the 500 meters?

A. She did not want to.

B. She was wounded.

C. She was not qualified.

D. It was not mentioned.