下列现象中属于光的折射的是：[ ] A. 树木在水中的倒影 B.日_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题选择题

下列现象中属于光的折射的是：[ ]

A. 树木在水中的倒影

B.日食、月食的形成

C.池水看起来比实际的浅

D.小孔成像

答案

答案：C

题目分析：

判断光的折射现象，要对折射的定义理解清楚，光从一种透明介质斜射入另一种透明介质中时，传播方向一般会发生改变，这是光的折射，生活中光在不均匀介质中不沿直线传播的现象也是光的折射．

解：A.平静的水面相当于平面镜，倒影是平面镜成的像，这是利用光的反射原理，故本选项不符合题意．

B.发生日食和月食时，太阳、月球、地球三者都在同一直线上，都可以用光沿直线传播来解释，不同的是发生日食时月球在中间；发生月食时地球在中间，故本选项不符合题意；

C.池底的光线由水中进入空气时，在水面上发生折射，折射角大于入射角，折射光线进入人眼，人眼会逆着折射光线的方向看去，就会觉得池底变浅了，故本选项符合题意．

D.小孔成像属于光沿直线传播现象，不是光的折射现象，故本选项不符合题意．

故选：C．

选择题

在玉米的开花季节，最容易造成减产的天气为（）

A．阴雨连绵，气温低

B．气温较低，雨水少

C．晴空万里，微风吹

D．春季多风，气温高

完形填空

A farmer found a wounded eagle (鹰) in his field. He was so   26   that he took it home and cleaned its wounds. After that he placed it 27 in the yard, in the hope that it    28    recover soon.
Strangely enough, the eagle soon got used to the    29   of all the chickens in the yard. It learned to    30    from side to side like chickens, and eat happily from a trough (食槽). For many years, the eagle    31    his new life on the farm.
Then one day, one of the farmer’s friends pointed to the playing    32   and asked, “  33   is that eagle acting like a chicken?” The farmer told him what had   34  , and the friend felt quite   35  .
“I can’t believe that!” said the friend. “It should fly in the    36   , not live here!” He picked up the eagle, and   37   it into the air. The eagle was  38  , and cried loudly. Then it just fell down on the ground.
That night, the friend could   39   sleep as he remembered the chicken-like eagle. The next morning, he headed back to the farm for another   40  . This time he carried the eagle to the   41   of a nearby mountain.
When he stood at the highest place of the mountain, he looked into its eyes and shouted, “Don’t you   42   ? You weren’t made to live like a chicken!” As he   43   the eagle up, he made sure it was facing into the bright   44   of the rising sun. Then he    45    tossed (抛) the bird into the sky. This time the eagle opened his wings, and disappeared into the clouds.

B．experienced