问题 解答题

在平面直角坐标系中,将坐标为(0,0),(2,4),(2,0),(4,4)的点用线段依次连接起来形成一个图案:(1)若这四个点的纵坐标若保持不变,横坐标变为原来的,将所得的四点依次用线段边境起来,所得图案与原来的图案相比有什么变化?

(2)纵坐标保持不变,横坐标分别加3,所得图案与原来的图案相比有什么变化?

(3)横坐标不变,纵坐标分别加3,所得图案与原来图案相比有什么变化?

(4)纵坐标保持不变,横坐标分别变为原来的2倍,所得图形一原图形相比有什么变化?

答案

解:画图形如下所示:原图为□OABC,

(1)与原图案相比,图案纵向未变,横向被压缩为原来的一半,图中□ODCE所示;

(2)与与原图案相比,图案大小没有变化,向右平移3个单位,图中□JKLM所示;

(3)与与原图案相比,图案大小没有变化,向上平移3个单位,图中□FGHI所示;

(4)与原图案相比,图案纵向未变,横向被拉长为原来的2倍,图中□OBQN所示。

选择题
阅读理解

Misery and setbacks are not always as terrible as one imagines. Hard times can offer new ways of looking at life that would otherwise never be known. And, if you are a writer, this can be the source of much of your success.

Popular British author, Charles Dickens' (1812-1870)family could hardly make ends meet. They could only afford to send one of their six children to school. Dickens was not that child. His parents chose to send a daughter, who had a talent for music, to an academy. Then at the age of 12, Dickens' life took another turn for the worse.

His father, a clerk, was placed in prison for unpaid debts. And, being the oldest male left at home, Dickens took up work at a factory. His horrible experience there became the fuel for his future writing. His father was freed three months later and inherited a small amount of money. Dickens was then sent to school.

From 1836 to 1837, he wrote a monthly series of stories. Thus the Pickwick Papers, came into being, which brought fame to the 23-year-old man.

Throughout his career, Dickens covers various situations in his novels. He wrote about the miserable lives of the poor in Oliver Twist, the French Revolution in Tale of Two Cities, and social reform in Hard Times. He also wrote David Copperfield, a book thought to be modeled on his own life.

“I do not write bitterly or angrily: for I know all these things have worked together to make me what I am,” he once said. His difficult childhood did indeed shape the person he became, as well as his writing career. There are shades of young Dickens in many of his most beloved characters, including David Copperfield and Oliver Twist.

Like the author, all these characters come from poor beginnings and are able to rise above their setbacks and achieve success. “Minds, like bodies, will often fall into an ill-conditioned state from too much comfort,” he once wrote. On June 9th, 1870, aged 58, Dickens died, leaving one unfinished work.The words on his tombstone read: “He was a sympathizer to the poor, the suffering and the oppressed, and by his death, one of England's greatest writers is lost to the world.”

小题1:The book that first called public attention to Dickens was ______.

A.the Pickwick Papers

B.Oliver Twist

C.Tale of Two Cities

D.David Copperfield小题2:The phrase “shades of” in bold means “_____”.

A.various shapes of

B.situations of

C.different experiences of

D.reminders of小题3:How did Dickens see his childhood?

A.He felt grateful for it.

B.He felt it a pity that things weren’t in his favor.

C.He loved writing about it.

D.He chose to forget the bitterness about it.小题4:From the story, we can see Dickens’ attitude towards an easy life is ______.

A.to enjoy it

B.to hate it

C.not to abandon yourself to it

D.to work hard for it