问题 单项选择题

如图所示,沿同一直线运动的物体A、B,其相对同一参考系的位置x随时间t变化的函数图像可知()

A.从第3s起,两物体运动方向相同,且vA>vB

B.两物体由同一位置开始运动,但物体A比B迟3s才开始运动

C.在5s内物体的位移相同,5s末A、B相遇

D.5s内A、B的平均速度相等

答案

参考答案:A

解析:

在x-t图象中,图线的斜率表示了物体运动的速度,故选项A正确;由图象可知B物体的出发位置是距参考点5m处,而A物体的出发点为参考点,故选项B错误;5s末时刻,两物体到达同一位置,即距参考点10m处,两者相遇,但由于两者出发点不同,因此位移不同,故选项C错误;平均速度是指物体的位移与所用时间的比,由于5s内A、B的位移不同,因此它们的平均速度也不同,故选项D错误。

阅读理解

阅读理解。

    Farquaad, the ruler of a country called Duloc, decides that all the characters from fantasy stories must

leave the country. There is a huge green monster called Shrek who lives in a forest and all the fantasy

characters hide in his home, although Shrek doesn't want them to.

    Shrek visits Farquaad. Farquaad agrees that the fantasy characters can come back if Shrek can find the

beautiful princess that Farquaad wants to marry. Shrek goes to look for the Princess Fiona. He finds her

and discovers that at night she becomes as ugly as him. When Farquaad discovers that Fiona is ugly, he

doesn't want to marry her. But the monster and the princess get married, and the princess decides to stay

ugly all the time for love.

1. The meaning of the phrase "fantasy stories" is ______. [ ]

A. 童话故事

B. 喜剧故事

C. 恐怖故事

D. 科学故事

2. Shrek goes to find the princess because ______. [ ]

A. he wants to marry her

B. he wants to kill the princess

C. Farquaad wants to marry her

D. he wants Farquaad to let the fantasy characters live in the country

3. The princess was called ______. [ ]

A. Farquaad

B. Shrek

C. Duloc

D. Fiona

4. Which of the following sentences is True? [ ]

A. Fiona decides to stay ugly because she loves Shrek.

B. Fiona decides to stay ugly because she wants to marry Farquaad.

C. Fiona decides to stay ugly because she can't become beautiful again.

D. Fiona decides to stay ugly because she isn't the princess.

5. What's the main idea of the passage? [ ]

A. Farquaad is a bad ruler of the country.

B. Characters from fantasy stories are in trouble.

C. The love between a monster and a princess.

D. Shrek saves Fiona so that he can become a hero.

多项选择题