题目内容
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The Indians invented and developed the system of numbers from 1 to 9 and 0. We can use the ten numbers to make any number from the biggest to the smallest.
However, the ancient Romans invented a different system (系统) of numbers. They used symbols (符号) and replaced them. 1 is “Ⅰ” and 2 is “Ⅱ”. For larger numbers, they invented new symbols—5 is “Ⅴ”, 10 is “Ⅹ”, and so on. But they didn’t have a symbol for zero.
Here’s a table of the Roman numbers.
1 | 5 | 10 | 50 | 100 | 500 | 1,000 |
Ⅰ | Ⅴ | Ⅹ | L | C | D | M |
The Romans combined their symbols. In this way, “Ⅶ” means “5+1+1”, or 7. However, they found that “ⅡⅡ” (for 4) and “ⅤⅡⅡ” (for 9) were too confusing, so they thought out another idea.
If the “Ⅰ” comes after the “Ⅴ”, then you add it (Ⅵ is 6); if the “Ⅰ” comes before the “Ⅴ”, then you subtract (减去) it (Ⅳ is 4). The rule is that you are allowed to add up to three (e.g. Ⅷ is 8), but only subtract one (e.g. XL is 40).
How to remember the symbols?
Ⅰis like a finger. In a whole hand, the thumb (拇指) and the little finger make a V. Ten fingers are both hands, so the two Vs make an X..
Here is a way to remember the other symbols (L, C, D, M):Little Cats Drink Milk.
( ) 51. How many numbers can we make according to the Indians’ system ?
A. three: 0, 9, 1 B. ten C. eleven D. lots of
( ) 52. Which number was not in the ancient Roman’s number system?
A. 1 B. 9 C. 0 D. 5
( ) 53. What does the underlined word “combined” probably mean in the passage?
A. 合并 B. 分离 C. 增加 D. 削减
( ) 54. What does MD mean according to the Romans’ rule of calculating?
A. 500 B. 1000 C. 1500 D. 2000
( ) 55 Which sentence is NOT true according to the passage?
A. “Little Cats Drink Milk” can help us to remember some of the numbers symbols.
B. The Indians invented the system of numbers from 1 to 9 and 0.
C. You are not allowed to make a number like “XXL”
D. The ancient Romans repeated symbols to make any number.
阅读下面短文,掌握大意,然后从A、B、C、D四个选项中选出最佳选项。(文章中带*的单词为生词)
小 词 典 ability n. 能力, 才干 magic n. 魔术,魔法 decrease v. 减少 magician n. 魔术师,魔法师 chopsticks n. 筷子 share v. 分享 course n. 一道菜 spread v. 传播 flu n. 流感 staple food 主食 Gala n. 晚会 superficial adj. 表面的 ger host n. 主人 trick n. 魔术,戏法 |
A
Developing school skills | ||||||||||||||||||||||||
These materials can help both teachers and students of different levels and grades.
? Lessons with textbooks ? Activity Sheets ? Answer Key with Explanations
Here are the lessons for you to choose |
( )46. Tom needs to improve his study skills. If he takes the lessons, he has to spend ______.
A. $75 B. $100 C. $ 120 D. $ 135
( )47. If you want to build your vocabulary, you will take ________lessons.
A.37 B. 43 C. 60 D. 70
( )48. The books in the picture are for ___________ to develop school skills.
A. students of lower grades B. students of different levels
C. both parents and children D. both teachers and students