c. second threeР【2011 四川达州】13. —if a=4, b=5, what’s the answer to the question “ a + 2ab +1 =?” — . Р a. forty‐fifth b. forty‐five c. twenty‐three d. one hundred and twenty‐one Р【2011•四川广元】14. —how often do you exercise? —___ Рa. two b. twice c. second Р【2011乌鲁木齐】15. the teacher said that__ of the boys would take part in the talent show. Рa. three five b. three fives c. thirds fifths d. three fifths Р【2011•广西柳州】16.tomorrow is the boy’s ________ birthday. Рa. seventh b. seven c. seventeen Р【2011 贵州毕节】17.—which is the biggest number of the four? — . Рa.one‐third b.two‐thirds c.a half d.a quarter Р【2011 福建莆田】18. —excuse me, where can i buy a jacket? Р—you can go to the men's wear section on the_________ floor. Рa. two b. twice c. second
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