问题 问答题 简答题

为什么会产生过冷现象?如何控制过冷程度?

答案

参考答案:

由于新相难以生成,加入晶种或控制搅拌速度

选择题
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You Did More Than Carry My Books

Mark was walking home from school one day when he noticed the boy ahead of him had dropped all of the books he was carrying,along with a baseball bat and several other things. Mark "_36" down and helped the boy pick up these articles. "_ 37  "they were going the same way,he helped to carry some of them for him. As they walked Mark "_38  " the boy's name was Bill,that he "_ 39  " computer games, baseball and history,that he was having a lot of "_40" with his other subjects and that he had just broken "_41" with his girlfriend.

They arrived at Bill's home first and Mark was "_42" in for a Coke and to watch some television.The afternoon passed "_ 43  " with a few laughs and some shared small talk, and then Mark went home.They "_ 44  "to see each other around school,had lunch together once or twice,and then both ended up from the same high school.Just three weeks before "_ 45 ",Bill asked Mark if they "_ 46  " talk.

Bill "_ 47  " him of the day years ago when they had first met.“Do you "_48" wonder why I was carrying so many things home that day?”asked Bill. “You see, I "_49 " out my locker because I didn't want to leave a mess (脏乱) "_50  "anyone else. I had planned to run away and I was going home to "_51 " my things. But after we

spent some time together "_52" and laughing,I realized that "_ 53  " I had done that, I would have "_ 54" a new friend and missed all the fun we would have together.So you see, Mark ,when you picked up my books that day ,you did a lot more .You "_ 55  "my life.”

36.  A. fell            B. sat          C. lay         D. knelt 

37.  A. Although        B. Since        C. After       D. Until 

38.  A. discovered      B. realized     C. said        D. decided 

39.  A. played          B. loved        C. tried       D. made 

40.  A. questions       B. ideas        C. trouble     D. doubt 

41.  A. up              B. out         C. off         D. away 

42.  A. called          B. helped       C. invited     D. allowed 

43.  A. peacefully      B. willingly    C. freely      D. pleasantly 

44.  A. continued       B. agreed       C. forced      D. offered 

45.  A. graduation      B. movement     C. separation  D. vacation 

46.  A. would           B. should       C. could       D. must 

47.  A. demanded        B. reminded     C. removed     D. asked 

48.  A. ever            B. usually      C. even        D. never 

49.  A. checked         B. took         C. cleaned     D. put 

50.  A. over            B. into         C. with        D. for 

51.  A. find            B. pick         C. pack        D. hold 

52.  A. talking         B. playing      C. reading     D. watching 

53.  A. before          B. if           C. while       D. as 

54.  A. forgotten       B. passed       C. left        D. lost 

55.  A. helped          B. recovered    C. improved    D. changed