速度，完形。谢谢，急急急。

阅读下面短文，掌握大意，然后从A、B、C、D四个选项中选出一个最佳选项。 When are you an adult? When do you think you are an adult? Maybe different 31 have different ideas. Now let's see what some American teenagers say. Sam: In 32 idea, you are an adult at the 33 of 18. That's when you can vote(投票）. You can help to 34 who rules the whole country. That's also a grown-up does! My grandfather couldn't vote 35 he was 21. They changed it to 18 in 1971. Jenny: I don't 36 it's hard to say. I can drive a car at 16, can't I? When you have a driver's license, you can 37 it to people to tell them your age for all kinds of things. 38 sixteen must be the age when you change from a 39 person to an adult. Because you can tell others you are not a 40 any more. Suzie: Well, I think there is 41 wrong with American laws for when young people can 42 things. I can vote at 18 and drive at 16. So you would think taht 18 is a grown-up, 43 16 isn't. But then I can't drink wine until I'm 21! If I'm 44 an adult at 18, how can people stop me from 45 a cup of beer in a bar? 31. A. teenagers B. adults C. drivers D. Grandfathers 32. A. his B. my C. her D. your 33. A. age B. end C. front D. Number 34. A. make B. keep C.choose D.teach 35. A. after B. until C. when D. if 36. A. hope B. want C. like D. think 37. A. show B. send C. ask D. pass 38. A. But B. And C. So D. Or 39. A. old B. young C. little D. tall 40. A. baby B. grown-up C. boy D. kid 41. A. anything B. everything C. something D. nothing 42. A. do B. buy C. like D. borrow 43. A. as if B. even though C. ever since D. above all 44. A. already B. still C. also D. yet 45. A. selling B. making C. drinking D. giving 老师每题都要有解析，34，38，43，44这四题是重点，我就这4题错了，请老师详细点。

解题思路： 见过程
解题过程：
答案是ABACB DACBD CABAC
同学你好，我稍后给你解释
最终答案：略