中学英语单词用法总结学习精编unit和unhappy和unfair等
understand (understood, understood)  [ʌndə'stænd]
v 理解，明白，懂得 （不用于进行时）
He is trying his best to understand his meaning.他正在尽力弄明白他的意思。

understanding   [ʌndə'stændɪŋ]
 n. [C, U]①领会，理解;②看法，理解力
 His understanding of English is good.他对英语的  理解力很好。
短语：1..make one-self understand 使别人理解自己的意思 

unexpected   [ʌnɪk'spektɪd; ʌnek-]
adj.出乎意料的，始料不及的
Help may also come from some unexpected places.帮助也可能来自某些意想不到的地方。
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unfair   [ʌn'feə]
  adj.不合理的，不公正的
It seems unfair on him to make him everything.让他承担一切费用似乎对他不公平。

unhappy  [ʌn'hæpɪ]
adj. 不幸福的；可怜的 ；不愉快的 (-ier, -iest ) ：
e.g. Everyone is unhappy in our neighborhood. 在我们社区每个人都不高
--- (adv) unhappily   (n) unhappiness 

unit  ['juːnɪt]
n. [C]单元，单位
e.g.This lesson is divided into four units. 这一课分为四个单元。
university  [juːnɪ'vɜːsɪtɪ]
n. ○1大学 ○2 大学人员 ：
e.g. She hopes to go to university next year.  她希望明年能上大学。
e.g. Soon , the whole university knew about her win. 不久，全院师生都知道她获胜了。

Directions: After reading the passage below, fill in the blanks to make the passage coherent and grammatically correct. For the blanks with a given word, fill in each blank with the proper form of the given word; for the other blanks, use one word that best fits each blank.
Lego wants your old Legos back
If you have a box of old Lego bricks sitting unused in a garage, Lego now wants them back. In a new program, consumers in the U.S. can dump old bricks in a box, print a free shipping label, and send them off to Give Back Box, a social enterprise___11___ will clean the toys and repackage them for Teach for America and the Boys and Girls Club of Boston.
 “The classic Lego brick is made from a tough material___12___ (call) ABS, and the toys can be played with for decades without breaking. It’s already fairly common, of course, that Legos ___13___ (hand) down from one child to another.” says Tim Brooks, vice president of corporate responsibility at Lego Group.
The company looked for a partner that could process the used toys while___14___ (maintain) Lego’s standard of quality. “We want to make sure that all kids are getting a great experience,” he says. “You shouldn’t get a really inferior experience ___15___ the bricks are donated. If the program goes well,” Brooks says, it ___16___ expand.
He sees it___17___ one version of the circular economy, a system of keeping materials in use-and argues that the toys themselves illustrate the idea of the circular economy. “You can build a rocket and then you can take ___18___ apart and build a ship, or a car, or a house, or ___19___ you like,” Brooks says. As toys are reused, that’s another circular system. We intend______20______ (show) that great quality toys like Lego can be used in lots of repeating circles-used, reused, donated, used, reused, donated.”
【答案】
11. that/which    
12. called    13. are handed    
14. maintaining    
15. although    
16. may/might    
17. as    18. it/that    
19. whatever    
20. to show

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