I hear someone at the door. Please go and see who is. A.knock,it B.knocking , it C.knock——青夏教育精英家教网—

摘要： I hear someone at the door. Please go and see who is. A.knock,it B.knocking , it C.knocking, he D.knock, he

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Dear Benter,
　　You have been away exactly two weeks today but it seems more like two years to me!
　　I’m glad to hear you’ll be back soon

. Are you coming directly home, dear? Or do you plan to m

ake some stops 36 the way? I hope you’ll be home in 37 for Patsy’s birthday next Sunday. She is 38 you to show films to her 39 friends.
Patsy keeps asking every day 40 you’ll be back. She says you never 41 that story you were telling her about 42 train that lost its “ toot”(喇叭嘟嘟声). You’d better 43 and think up a good ending 44 it. You know how Patsy is? She 45 be happy until she knows exactly what __46 to the “toot” and 47 the little train got it back 48 !
　　Everything at home is fine except that we 49 you so much! I’ve been 50 with the spring cleaning. Yesterday I had Cora 51 in to wash the kitchen walls and she did a very good __52 of it. The kitchen looks as though it’s been repainted. I made some new yellow curtains, and they 53 very beautiful.
　 I went to see your mother yesterday. Her 54 is all gone and she looks very 55 . Your sister Jean looks wonderful! She has taken off about fifteen pounds since she began dieting. But now she’s complaining that none of her clothes fit!
Hope to see you before next Sunday.
　 Love and kisses to you!
　　　　

　　　　　　　　　　　　　     Yours
　　　　　　　　　　　　　　　　　           Lynn
【小题1】A in           B. on          C. at          D. along

There are nineteen boys and twenty-eight girls in our class. 1 　the boys is English. His 2 is Sam. He is thirteen. Two of the 3 are American. They are twins. 4　names are Lucy and Jane. They are twelve. They are my 5　. All of the other boys and girls are 6 　. We all like the English boy and the American girls, 7 they like us, too. We play games together（一起）. We help 8 and they help us.
　　Look, there 9 the twins! They are coming this way. Let's 10 hello to them.

数学的美学无处不在，数学家们研究发现，弹拨琴弦发出声音的音调高低取决于弦的长度，绷得一样紧的几根弦，如果长度的比能够表示成整数的比，发出的声音就比较和谐．例如，三根弦长度之比是15：12：10，把它们绷得一样紧，用同样的力弹拨，它们将分别发出调和的乐声do、mi、so．研究15、12、10这三个数的倒数发现：

．我们称15、12、10这三个数为一组调和数．现有一组调和数：x、6、4（x＞6），则x的值是　　．

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在半径为27m的圆形广场中心点O的上空安装了一个照明光源S，S射向地面的光束呈圆锥形，其轴截面SAB的顶角为120°(如图)，则光源离地面的垂直高度SO为

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在半径为27 m的广场中央，点O的上空安装了一个照明光源S，S射向地面的光束呈圆锥形，其轴截面SAB的顶角为120°(如图24-4-2-5)，求光源离地面的垂直高度SO.(精确到0.1 m；

　　图24-4-2-5

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