如果把3：7的前项加上9，要使比值不变，后项应（ ） A．加上9 B．减去9 C．乘以 发布时间：2017-06-15 18:36 │ 来源：www.tikuol.com 题型：选择题 问题： 如果把3：7的前项加上9，要使比值不变，后项应（ ）A．加上9B．减去9C．乘以4
题型：选择题 完形填空。 After the birth of my second child, I got a job at a restaurant. Having worked with an experienced 1 for a few days, I was 2 to wait tables on my own. All went 3 the first week. When Saturday nightcame, I was luckily 4 the tables not for from the kitchen. 5 , I still felt it a little hard to carry the heavy trays (托盘). Before I knew it, the 6 was full of people. I moved slowly, 7 every step. I remember how 8 I was when I saw the tray stand near the tables; it looked different from the one I was 9 on. It had nice handles, which made it 10 to move around. I was pleased with everything and began to 11 I was a natural at this job. Then, an old man came to me and said, "Excuse me, dear, my wife and I loved 12 you work. It seemsyour tray stand has been very 13 to you, but we are getting ready to 14 now, and my wife needs her 15 back." At first his 16 did not get across. "What was he talking about!" Then, I got it. I had set my trays on his wife's orthopedic walker (助步器). I stood frozen as ice, but my face was 17 . I wanted to get into a holeand 18 . Since then, I have learned from many mistakes such as the one I just 19 I have learned to be more 20 and not to be too sure of myself. ( )1. A. manager ( )2. A. promised ( )3. A. well ( )4. A. left ( )5. A. Therefore ( )6. A. kitchen ( )7. A. minding ( )8. A. angry ( )9. A. fixed ( )10. A. slower ( )11. A. believe ( )12. A. letting ( )13. A. useful ( )14. A. rest ( )15. A. bag ( )16. A. idea ( )17. A. cold ( )18. A. lie ( )19. A. repeated ( )20. A. careful B. assistant B. invited B. quickly B. given B. However B. street B. changing B. calm B. trained B. lighter B. making B. making B. familiar B. order B. walker B. praise B. full of joy B. hide B. discovered B. patient C. cook C. allowed C. safely C. brought C. Otherwise C. restaurant C. taking C.sad C. loaded C. regret C. watching C. watching C. unusual C. eat C. tray C. message C. pale C. defend C. corrected C. honest D. waitress D. advised D. wrong D. shown D. Finally D. table D. saving D. happy D. waited D. pretend D. having D. interesting D. interesting D. leave D. coat D. need D. on fire D. stay D. described D. practical 查看答案
题型：选择题 假定有以下循环结构。 Do until 条件 循环体 Loop 则下列说法正确的是( )。A) 如果“条件”是一个为-1的常数，则一次循环体也不执行B) 如果“条件”是一个为-1的常数，则至少执行一次循环体C) 如果“条件”是一个不为-1的常数，则至少执行一次循环体D) 不论“条件”是否为“真”，至少要执行一次循环体 查看答案