问题 填空题
判断.
(1)面积相等的两个三角形一定能拼成一个平行四边形.______
(2)正方形有4条对称轴,平行四边形有2条对称轴.______
(3)一个长方形的长和宽都增加5厘米,它的面积就增加25平方厘米.______
(4)某种手机的价格先降价5%,又降价10%,现价是原价的85%.______
(5)圆的周长是它半径的3.14倍.______
(6)边长是4厘米的正方形,它的面积和周长都相等.______
(7)两个面积相等的三角形一定可以拼成一个平行四边形.______
(8)长度单位之间的进率是10,面积单位之间的进率是100,体积单位之间的进率是1000.______
(9)一段路程,甲行完全程要4小时,乙要5小时,甲乙两人的速度比是4:5.______
(10)平角是一条直线.______
(11)a和b互质,b和c互质,那么a和c一定互质.______
(12)今年小军比小明大a岁,5年后,小军就比小明大(a+5)岁.______
(13)20以内所有质数的和是77.______
(14)圆锥的体积比圆柱体积小
2
3
.______
(15)如果圆柱体积是圆锥体积的3倍,那么它们一定等底等高.______
(16)大小两圆直径比是3:2,如果两个圆直径都扩大5倍,则大小圆的面积比15:10.______.
答案

(1)面积相等的两个三角形一定能拼成一个平行四边形.×

(2)正方形有4条对称轴,平行四边形有2条对称轴.×

(3)一个长方形的长和宽都增加5厘米,它的面积就增加25平方厘米.×

(4)某种手机的价格先降价5%,又降价10%,现价是原价的85%.×

(5)圆的周长是它半径的3.14倍.×

(6)边长是4厘米的正方形,它的面积和周长都相等.×

(7)两个面积相等的三角形一定可以拼成一个平行四边形.×

(8)长度单位之间的进率是10,面积单位之间的进率是100,体积单位之间的进率是1000.×

(9)一段路程,甲行完全程要4小时,乙要5小时,甲乙两人的速度比是4:5.×

(10)平角是一条直线.×

(11)a和b互质,b和c互质,那么a和c一定互质.×

(12)今年小军比小明大a岁,5年后,小军就比小明大(a+5)岁.×

(13)20以内所有质数的和是77.√

(14)圆锥的体积比圆柱体积小

2
3
.×

(15)如果圆柱体积是圆锥体积的3倍,那么它们一定等底等高.×

(16)大小两圆直径比是3:2,如果两个圆直径都扩大5倍,则大小圆的面积比15:10.×

故答案为:×、×、×、×、×、×、×、×、×、×、×、×、√、×、×、×.

单项选择题 A1/A2型题
阅读理解

Have you ever noticed what happens to an idea once you express it? Just talking about it or writing it down causes you to make it clear in your own mind. How can you use this to increase your brain power? Start writing.

By putting thoughts into words, you are telling yourself the logic (逻辑) behind what you think, feel, or only partly understand. Often, explaining a thought is the process of understanding. In other words, you increase your brain power by exercising your “explain power.”

Try this experiment. Explain how you’ll increase your brain power, even if you have no idea right now. Just start with anything, and create an explanation. For example, start with “I’ll learn chess,” or “I’ll read an article on the mind every week.” Explain how that will help. You’ll be surprised how often this becomes a workable plan, and if you actually do this, you’ll have a better understanding of your brain from now.

Another benefit of writing is that it helps you remember. Many, if not most, highly productive people are always taking notes. You can try keeping it all in your head, but if you keep a journal of your ideas the next time you’re working on a big project, you’ll probably have more success.

Want to understand a topic? Write a book about it. That’s an extreme example, but if you are learning something new, write a letter to a friend about it, and you will understand it better. Want to invent something? Write an explanation of the problem, why you want to solve it, and why it is worth solving, and you’re half-way there.

Writers don’t always write because they clearly understand something beforehand. Often, they write about something because they want to understand it. You can do the same. Writing will help bring you to an understanding. Give it a try.

小题1:What would be the best title for the text?

A.A Way on How to Write.

B.Increase Your Brain Power through Writing.

C.Brain Power Helps Improve Your Writing.

D.How to Start Your Writing.小题2:According to the text, writing can help you a lot in the following ways EXCEPT ______.

A.the increase of your brain power

B.the ability to remember

C.the development of your interest in study

D.the better understanding of a topic小题3: If a writer writes something, it means that he or she ______.

A.has understood it very well

B.needs to understand it better

C.wants to remember it in his or her mind

D.is exercising his or her “explain power”小题4:The underlined sentence “you’re half-way there” in the fifth paragraph implies

that ______.

A.you are already successful

B.you still need to work hard

C.writing can help you walk half way

D.writing is important to solve problems小题5: What’s the main purpose of the writer writing the text?

A.To advise readers to start their writing.

B.To explain the importance of writing.

C.To persuade readers to become writers.

D.To increase readers’ brain power.