7. The four books are all about _______.
A. fiction and mysteries
B. parenting and teaching
C. literature and arts
D. language study
[答案与解析]
6. By saying “You’ll finally know your grammar backwards and forwards”, the writer means “________”.
A. You will be clearly familiar with grammar
B. You will know the history of grammar
C. You will know the make-up of grammar
D. You will learn about the future of grammar
5. If a ten-year-old boy wants himself to be admired because of his speech ability, he may buy _______.
A. Word Power
B. Word Smart Junior
C. Grammar Smart Junior
D. Grammar Smart: An Audio Guide to Perfect Usage
4. What did the explorers find?
A. The coastlines of South America and Africa could fit together.
B. The coastlines of North America and Africa could fit together.
C. The east coastlines of North America and the west coast of Europe could fit together.
D.The coastlines of North America and India could fit together.
(二)
Word Power
Author(s): Kaplan $13.95
You’ll never be at a loss for words again. Energize your vocabulary with must-know everyday words that are the essentials of a good vocabulary, engaging lessons to help you use words in text, hot words often found on tests, tips to help you figure out new words, roots, and more.
Grades: 8 & up Ages: 13 & up
Word Smart Junior
Author(s): Russell Stauffer $ 17.95
Now this is the way to add new words to your vocabulary! Word Smart Junior will make you laugh so much. You’ll be amazed that you’ve just learned more than 120 fascinating and very useful words! Parents, teachers, and friends will marvel at your eloquence (口才)!
Grades: 3-5 Ages: 8-10
Grammar Smart Junior
Author(s): Marcia Reynolds $ 16.85
Do you quake when your teacher says, “Now it’s time for grammar”? Do your verbs agree with your subjects?
Fear no more! A big Hollywood producer and a famous movie star will help you learn all those nasty (讨厌的) elements of grammar. You’ll be amazed at how quickly you learn, and how much fun it can be. You’ll finally know your grammar backwards and forwards, and you’ll never have to worry about it again.
Grades: 7-9 Ages: 12-14
Grammar Smart: An Audio Guide to Perfect Usage
Author(s): Julian Fleisher $ 12.68
The words you use say a lot about you … but the way you put them together says even more. Your grammar makes an immediate and lasting impression on your teachers, and even your friends. So don’t make the mistake of thinking that grammar is too complicated. We’ve created Grammar Smart to help you write and speak with clarity and confidence.
Grades: 6-8 Ages: 11-13
3. The last word of the third paragraph “tectonics” mean “________”.
A. study of construction
B. study of architecture
C. earth surface
D. structural geology
2. Which of the following is true according to the passage?
A. We didn’t see the Earth from far away until we saw the picture taken in the space.
B. Our ancient thought that the surface of the earth is still.
C. Alfred Wegener was not the first person to investigate the idea that the continents move.
D. The coastline of India and Africa fit together.
1. What does the writer mainly tell us in the passage?
A. The first breath-taking pictures of the Earth taken from space.
B. Human’s recognition of the earth’s surface.
C. The German scientist Alfred Wegener.
D. The early explorers’ discovery.
40．小杰为了既省电又方便年迈的奶奶入厕时开灯，利用已学的电学知识对家里厕所的照明电路进行了改装。他将一个“额定电压220V、额定功率40W”的灯泡、一个阻值为1210Ω的定值电阻和一个开关S连成了电路。当无人入厕时，灯光较暗，但能起到一定的照明作用，当有人入厕时，闭合开关，灯泡就正常发光。(假定灯泡电阻不随温度变化；计算结果若有小数保留两位小数。)
则：(1)灯泡L的电阻是多少？
(2)请根据题中的提示画出电路
(2)开关断开时，通过电阻R的电流是多少？
(3)计算说明无人入厕时和有人入厕时，电路消耗的总功率哪个大？
39．如图所示是一台正在建筑工地作业的起重机，吊臂上有滑轮组(1)请在图中画出滑轮组的绕线图。
(2)将质量为1.2×103kg的重物竖直匀速提高3m，拉力F由一台柴油机提供，其大小为8000N，提高重物所用的时间为4s。(g取10N／kg)吊臂上滑轮组的机械效率为多大?
(3)柴油机的输出功率为多大?
(4)已知柴油机的效率是40%，这次提高重物消耗了多少g柴油?(柴油的热值是4×107J／kg)
38．环保部门对某工厂的废水进行抽样分析，结果表明废水中含少量硫酸。取一定量废水用质量分数为2%的氢氧化钠溶液中和(已知废水中的其它成分不与氢氧化钠反应)，至pH = 7时，消耗氢氧化钠溶液的质量为40g，同时测得反应后溶液质量为138g。请计算该工厂排放的废水中硫酸的质量分数。
如图所示是一台正在建筑工地作业的起重机，吊臂上有滑轮组(1)请在图中画出滑轮组的绕线图。