法国作家巴尔扎克的作品（）中成功塑造了世界文学人物画廊中著名的吝啬鬼形象。

下列运算正确的是[ ]

A．a²﹣a³=a⁶

B．（a²）³=a⁵

C．3a+2a=5a

D．a⁶÷a³=a²

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★Share Flat. Happy Valley big flat, 1 room ready for use immediately, quiet

and convenient, fully furnished, park view. $6,800 including bills with maid（女佣）.

Female nonsmoker. No pet. Sara 25720836 or 10077809.

★Moving Sale: 2 armchairs, red/ brown at $400 each; coffee table, black, wood,$800; oil painting, big, $900; Tianjin carpet, green, 3×7, $600; double bed, $500; mirror, big square, $500;  fridge, big, double-door, $1,000; old pictures, $140 up, each.  Tel: Weekend, 2521-6011; Weekday, 2524-5867.

★Part-time Laboratory Assistant Wanted. Required by busy electronics company to help with development of computer. Should have an electronics degree and some practical experience of working in an electronics laboratory. Hours 9:30am-1:00pm, Mon.-Fri. Fourteen days, paid leave. Salary 6,598-10,230 dependent on experience. Letter of application to: Mrs G Chan, NOVA ELECTRONICS, 45 Gordon RD, Hung Hom Knowloon.

49. The one who puts on the first advertisement probably wants to ______.

A. rent a beautiful flat of her own in Happy Valley

B. find another lady to share the cost to rent a flat

C. share her room in a flat with whoever has no pet

D. find a maid to look after herself

50. According to the advertisements, you may _______.

A. buy an old picture for $150

B. call 25720836 to see a beautiful lake

C. buy two armchairs for $400

D. hire a maid （女佣）by paying $6,800

51. If you want to buy some old furniture, you should  ______. 

A. get in touch with NOVA  ELECTRONICS

B. call 2524-5867 any day except Monday

C. do it before you move to another place

D. call either 2524-5867 on Monday or 2521-6011 on  Saturday

52. Once you get a part-time job in NOVA ELECTRONICS,  _______.

A. you will be given 14 days off each year besides weekends

B. you will get $6,598 each month no matter how experienced you are

C. your have to work at least 8 hours a day

D. you should write a letter of application to Mrs G Chan

陈启源回国以后，于1873年创办一个名叫继昌隆丝偈的缫丝厂的生产车间（如下图），以下有关它的表述，不正确的是

A．这是中国最早采用机器生产的民族企业之一

B．这是中国最早的民族资本主义企业之一

C．这是从手工工场发展而逐步形成的工厂

D．这是中国新的生产力代表之一

一枚在空中飞行的导弹，质量为m，在最高点的水平速度大小为v。导弹在该点突然炸裂成相等的两块，其中一块的速度为零，另一块的速度为2v沿速度v的方向飞出，不计空气阻力，爆炸的时间极短，试求：

（1）火药爆炸时对导弹所做功？

（2）已知导弹爆炸时离水平距离的高度为h，炸裂后的两块落到地面上时相距为多远？

肢体完全缺血多少时间，则会发生肢体永久性功能障碍。（）

A.6～12小时

B.12～24小时

C.24～36小时

D.2小时

E.30分钟