问题
计算题
因式分解
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答案
（1）原式=2abc(a-2b+4c)； （2）原式=(x2-2-7)2=(x2-9)2=(x+3)2·(x-3)2
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因式分解
|
（1）原式=2abc(a-2b+4c)； （2）原式=(x2-2-7)2=(x2-9)2=(x+3)2·(x-3)2
| 完形填空 | |||
| The other day I was invited to a friend's house for supper-and had a meal I have never had before. All the friends invited were a little __1__.It's not that Ben is unsociable,or a bad cook,but it's just that he never __2__ more than he has to.So how come he was inviting us round for a meal?Had he bought something __3__ for his friends?He greeted us at the door and showed us into his dining room where a __4__ table was waiting for us."Nothing but the __5__ for my friends!" said Ben.We all sat down and looked __6__ at each other-what was he up to? Ben returned with four bowls of hot soup."It's a __7__ of carrots,potatoes and tomatoes," said Ben. The next __8__ was also a little strange in that we didn't quite know what it was again.It's just another mixture of vegetable. As we ate we chatted and finally the __9__ turned back to what we were eating."Was there a recipe(食谱)for this,"asked Marina,"or did you __10__ it up?"Ben put his fork down."What I cooked __11__ what I could find."Marina was surprised."But you can find anything in supermarkets these days.""But there's __12__ choice in what you can find outside supermarkets," he replied. __13__ that we had all finished the food,Ben decided to tell the truth.He had read recently that supermarkets usually throw away 5 percent of their food every day.So Ben decided to look inside his local supermarket bins.There he found food that was slightly out of __14__,boxes of throwaway vegetables and fruit. So Ben had successfully provided a decent meal for his friends,and made us away of the fact that there are many poor people who need the food,but the amount of food thrown away in enough to __15__ millions of people. | |||
| ( )1. A. excited ( )2. A. takes ( )3. A. cheap ( )4. A. new ( )5. A. freshest ( )6. A. nervously ( )7. A. mixture ( )8. A. course ( )9. A. dinner ( )10. A. pick ( )11. A. referred to ( )12. A. less ( )15. A. enrich ( )14. A. order ( )13. A. Feeling | B. disappointed B. spends B. special B. separate B. most B. carefully B. liquid B. food B. idea B. look B. depended on B. more B. please B. place B. Seeing | C. surprised C. uses C. practical C. booked C. best C. sadly C. matter C. soup C. food C. make C. lay in C. some C. affect C. season C. Realizing | D. delighted D. does D. usual D. laid D. least D. happily D. dish D. salad D. subject D. take D. resulted from D. any D. feed D. date D. Thinking |