边长为L的正方形金属框在水平恒力F作用下运动，穿过方向如图所示

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问题选择题

边长为L的正方形金属框在水平恒力F作用下运动，穿过方向如图所示的有界匀强磁场区域。磁场区域的宽度为d（d>L）。已知ab边进入磁场时，线框的加速度恰好为零。则线框进入磁场的过程和从磁场另一侧穿出的过程相比较，有

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A.产生的感应电流方向相同

B.所受的安培力方向相反

C.进入磁场过程的时间等于穿出磁场过程的时间

D.进入磁场过程的发热量少于穿出磁场过程的发热量

答案

答案：D

完形填空

Checks have largely taken the place of money as a means of 36 , for they are widely accepted everywhere. 37 this is very 38 for both buyer and seller, it should not be forgotten that checks are not real money: they are quite 39 in themselves. A shop-keeper runs a certain 40 when he accepts a check and he is quite 41 his rights if, on occasion, he 42 to do so. People do not always know this and are 43 if their good faith is called in question. A wealthy friend of mine told me he had an extremely 44 experience.
One day he decided to buy a particularly fine pearl necklace at a famous jewelry shop which keeps a large__45 of precious stones and asked if he could pay 46 check, the assistant said that this was quite 47 . But the moment my friend signed his name, he was invited into the manager’s office. The manager was very polite, but he explained that someone 48 exactly the same name had presented them with a worthless check not long ago. My friend got very angry at it and said he would buy a necklace 49 . When he got up to go, the manager told him that the police would arrive at any moment and he had better stay 50 he wanted to get into serious trouble. Sure enough the police arrived, __51 to my friend for the 52 , but explained that a person who had used the same name as his 53 for a number of recent robberies. Then the police asked my friend to 54 out a note which had been used by the thief in a number of shops. The note read, “I have a gun in my pocket, ask no questions and give all the money in the safe.” Fortunately, my friend’s handwriting was quite__55__ the thief’s. He was not only allowed to go without further delay, but to take the pearl necklace with him.

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选择题

下列各句中，加粗的成语使用不恰当的一句是[ ]

A．美国奥巴马政府如果对中国政府发表的严正声明和强烈抗议置若罔闻，一意孤行坚持会见达赖，必将自食其果。

B．人们对张艺谋的影片《三枪拍案惊奇》诟病很多，不少人认为，如果换成一位初出茅庐的年轻导演，也许不会遭到如此非议。

C．最近到沿海地区，虽然只是浮光掠影地看看，但“五点一线”的战略却给我留下了极深刻的印象。

D．这个博物馆收藏的文物琳琅满目、不可胜数，其中所收藏的名画只有巴黎的罗浮宫可与其相提并论。

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