72.　 我希望尽快收到你的照片。(hope)

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71．上周因为生病我缺了一些课，但是我会努力赶上大家的。(miss)

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Adults are often surprised by how well they remember something they learned as children but have never practised in the meantime. A man who has not had an opportunity to go swimming for years can 　41　 　swim as well as ever when he gets back in the water. He can got on a bicycle after several decades and still 　42　 　away. A mother who has not 　43　 the words for years can teach her daughter the poem that begins “ Twinkle, twinkle, little star” or recite the story of Cinderella or Snow White.

One explanation is the law of over learning, which can be stated as following:　 44　 　we have learned something, additional learning increases the 　45　 　of time we will remember it.

In childhood, we usually continue to practise such skills as swimming, bicycle riding long after we have learned them. We continue to listen to and 　46　 　ourselves of poems such as “Twinkle, twinkle, little star” and childhood tales such as Cinderella or Snow White. We not only learn but 　47　 .

The law of over learning explains why cramming (突击学习) for an examination,　 48　 it may result in a passing grade, is not a 　49　 　way to learn a school course. By cramming, a student may learn the subject well enough to get by on the examination, but he is likely soon to forget almost everything he learned. A little over learning;　 50　 , is usually a good investment toward the future.

41. A. only　　　　 　　　　 B. hardly　　　 　　　　 C. still　　　　　 　 D. even

42. A. more　　　 　　　　 B. drive　　　　 　　　 C. travel　　　　 　　 D. ride

43. A. thought about 　　　　 B. cared for　　　 　　 C. showed up　 　　　 D. brought up

44. A. Before　　 　　　　　　 B. Once　　　　 　　 C. Until　　　 　　　　　 D. Unless

45. A. accuracy　　 　　　　 B. unit　　　 　　　　　 C. limit　　　　 　　　 D. length

46. A. remind　 　　　　　　　 B. inform　　　 　　　 C. warm　　　 　　　　 D. recall

47. A. recite　　 　　　　　　　 B. overlearn　 　　　　 C. research　　　 　　 D. improve

48. A. though　　 　　　　　 B. so　　　　　 　　 C. if　　　　　　 　　 D. after

49. A. convenient　 　　　　 B. demanding　　　 C. satisfactory　 　　　 D. swift

50. A. at most　　　 　　　 B. by the way　　 　 C. on the other hand　 D. in the end

There are two main reasons 　31　 (关系代词或关系副词词) the temperature of the air is always 　32　 (change的正确形式). One reason is that the air around you moves in from somewhere else .　 Air usually moves in large bodies 　33　 　(call 的正确形式) air masses. Some air masses move in from the north. These air masses usually have cold air that cause the temperature　 34　 (drop的正确形式).　 Air masses also move in from the south. They usually have 　35　 (warm的正确形式) air that causes the temperature to rise.

Temperature 　changes during the day or night can be great 　36　 　(连词)small. This depends partly 　37　 　(介词) how many clouds are in the sky.　 　38　 　(连词)there are many clouds during the night, they act like tile covers on your bed. They blanket the earth and keep the air from losing much of 　39　 　(代词)heat. The temperature usually does not drop much during such a night. When there are many clouds during 　40　 (冠词)day, some of the sun's energy will not reach the earth. The temperature usually does not rise much on such a day.