问题 解答题

已知直线经过点A(1,1),B(-1, 7),求直线与x轴交点C和与y轴交点D的坐标

答案

y=-3x+4    C(,0)   D(0,4)

分析:设这个一次函数解析式为y=kx+b,根据一次函数图象经过(1,1)和(-1,7)两点,列出二元一次方程组,解得k和b的值,然后令x=0求出交点C,再令y=0,求出与y轴交点D的坐标.

解答:解:设这个一次函数解析式为y=kx+b,

∵一次函数图象经过(1,1)和(-1,7)两点,

解得k=-3,b=4,

故直线方程为y=-3x+4,

令x=0,解得y=4,

令y=0,解得x=

故直线与x轴的交点C(,0),与y轴交点D(0,4).

点评:本题主要考查待定系数法求一次函数的解析式的知识点,解答本题的关键是设出函数的解析式,解二元一次方程组,本题比较简单.

阅读理解

Everyone has got two personalities (性格) —the one that is shown to the world and the other that is secret and real. You don’t show your secret personality when you’re awake because you can control yourself, but when you’re asleep, your sleeping position shows the real you. In a normal night, of course, you often change your sleeping positions. The important position that best shows your secret personality is the one that you go to sleep.

If you go to sleep on your back, you’re a very open person. You normally trust people and you are easily influenced by new ideas. You don’t like to make people unhappy, so you never express your real feelings. You’re quite shy and you aren’t very confident.

If you sleep on your stomach, you are a person who likes to keep secrets. You worry a lot and you’re always easily becoming sad. You never want to change your ideas, but you are satisfied with your life the way it is. You usually live for today not for tomorrow.

If you sleep on curled up (蜷缩), you are probably a very nervous person. You have a low opinion of yourself and often protect yourself from being hurt, so you are very defensive. You’re shy and you don’t usually like meeting people. You like to be on your own.

If you sleep on your side, you have usually got a well-balanced (平衡的) personality. You know your strengths and weaknesses. You’re usually careful. You have a confident personality. You sometimes feel worried, but you don’t often get unhappy. You always say what you think, even if it makes people angry.

小题1:You may find the passage in_____.

A.a science magazine

B.a guide book

C.a sports newspaper

D.a story book小题2: When does the sleeping position best show your secret personality?

A.In the daytime.

B.At the beginning of sleep.

C.At night.

D.During the deep sleep.小题3: Tina hardly tells her secrets to her friends. She probably goes to sleep _______.

A.on curled up

B.on her stomach

C.on her back

D.on her side小题4:What does the word "defensive" mean in the passage?

A.易怒的

B.攻击性的

C.外向的

D.有戒心的小题5: What does the passage tell us?

A.Sleeping on your side is the best way of sleeping.

B.Changing positions will cause sleeping problems.

C.Sleeping positions show people’s secret personalities.

D.Enough sleep makes people look better and healthier.

单项选择题