不可抗力是指不能预见并且不可避免的客观情况。( )

如图甲所示，光滑且足够长的平行金属导轨MN、PQ固定在同一竖直面上，两导轨间距d=1m，电灯L的电阻R=4Ω，导轨上放一质量m=1kg、电阻r=1Ω的金属杆，长度与金属导轨等宽，与导轨接触良好，导轨的电阻不计，整个装置处于磁感应强度B=0.5T的匀强磁场中，磁场的方向垂直导轨平面向里．现用一拉力F沿竖直方向拉杆，使金属杆由静止开始向上运动，经3s上升了4m后开始做匀速运动．图乙所示为流过电灯L的电流平方随时间变化的I²-t图线，取g=10m/s²．求：

（1）3s末金属杆的动能；

（2）3s末安培力的功率；

（3）4s内拉力F做的功．

治疗心阳不振、心悸、脉结代者，当选用的药物是

A．桂枝配白芍

B．桂枝配附子

C．桂枝配茯苓

D．桂枝配猪苓

E．桂枝配甘草

某校学生会打算开展“创诚信校园，做诚实学生”活动，决定在同学们中进行诚信状况调查，现请你担任组长。

（1）就调查的程序问题，你的组员向你提出了以下建议：①与部分老师和同学座谈；②设计调查方案；③向学校提出具体建议；④整理交流分析材料。请你按正常的活动顺序将上述建议排序（只写数字序号即可）（         ）。（2分）

（2）调查小组向你做如下采访，面对诚信的考验，结合所学知识谈谈你的真实做法或想法。

①你约了朋友，妈妈却说要带你去玩，你会                                     

因为                                                                 （2分）

②这次考试不及格，回家要被父母批评，你会                                    

因为                                                                 （2分） 

下表是调查小组统计的结果：（注：调查人数60人）

欺骗过家 长老师的	考试作 过弊的	抄袭过 作业的	涂改过试 卷分数的	有过不守 承诺现象的
18人次	13人次	20人次	4人次	22人次

（3）①上面调查表格统计的结果说明了什么问题？（1分）

②你们决定向学校领导提出关于加强中学生诚信教育的建议，你认为建议应包括哪些内容？（3分）

Zipped into a bag, it looks like a large umbrella. Unfolded, it goes along the street like any other bicycle.

It's the "A-bike", the brainchild (脑力劳动的产物) of British inventor Sir Clive Sinclair, who made history in the 1970s by developing the world's first pocket calculator. He described his new invention as "the world's smallest, lightest foldable bicycle".

"My original thought was that if you could have a bicycle that was dramatically lighter and more firm than the ones that exist today, it would change the way in which bicycles are used,"said Sinclair.

The mini-bike, showed in Singapore last week and set to go on sale worldwide in 2005 at a price of nearly US$300, is built for riders as heavy as 112 kilograms and is height-adjustable（可调整高度的）. It takes about 20 seconds to fold or unfold.

Its wheels are a quarter the size of those on a regular bicycle, but Sinclair promises a smooth ride for most cyclists. "You require no extra energy to ride the A-bike and it can go up to 15 miles per hour (24 kilometers per hour)," he said. Constructed mainly of plastic, the 5.5-kilogram bicycle folds into a package of less than 0.03 cubic meters （立方米）.

Sinclair also invented the first pocket TV in 1984 and the futuristic C5 electric tricycle in 1985. He said he hoped the bicycle would attract common citizens, officials, campers or anyone needing transport for a short trip and he said the next step for the A-bike was to add an electric motor in a few years.

小题1:The most important character of this kind of bike is its ________ .

A．big size

B．light weight

C．beautiful appearance

D．foldable structure小题2:The wheels of a regular bicycle is ________ the size of this kind of bike.

A．four times

B．three times

C．one-fourth

D．one-third小题3:This kind of new bike is mainly made of ________ .

A．plastic

B．packages

C．bags

D．metal小题4:The best title of the text is ________ .

A．World's smallest foldable bicycle arriving

B．A new bike, a large umbrella

C．A foldable bike, a large bag

D．A great inventor of a new bike小题5:This kind of new bike hasn't been fixed with ________ .

A．a wheel

B．an electric motor

C．pedal

D．a hand

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