阅读下面短文，掌握其大意，然后从1－15各题所给的A、B、C和D项中，选出最佳选项。
On Thursday afternoon Mrs Clarke locked the door and went to the women`s club as usual. It was a pleasant way of passing time for an old woman who lived 1____
When she came home she sensed something 2____ . Had someone got in? The back door and the windows were all locked and there was no 3____ of forced entry (进入). Had anything been taken? She went from room to room, checking , and found her camera and spare watch missing.
The following Thursday she went out at her usual time, but didn`t go to the club. 4___ , she took a short walk in a park nearby and came home, letting herself in through the back door. She settled down to wait and see what would 5____
It was 4 o'clock when the front doorbell rang. Mrs Clarke was 6____ tea at the time. The bell rang again, and 7____she heard her letter box being pushed open .8____the kettle (壶) of boiling water, she moved quietly towards the door. A piece of wire appeared through the letterbox, and then a 9____ . The wire turned and caught around the knob (圆形旋钮) on the doorlock. Mrs Clarke raised the kettle and poured the water over the hand. 10____was heard outside as the 11____ fell to the floor and the hand was pulled back, which was 12____ by the sound of running feet.
It wasn`t long 13____ the police caught the thief. And Mrs Clarke was greatly 14____ at the club for her successful 15____ .
| 小题1: | | A．lonely | B．alone | C．away | D．busily |
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| 小题2: | | A．terrible | B．uncomfortable | C．unusual | D．bad |
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| 小题3: | | A．information | B．show | C．sight | D．sign |
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| 小题4: | | A．Therefore | B．However | C．Instead | D．Again |
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| 小题5: | | A．appear | B．follow | C．happen | D．do |
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| 小题6: | | A．cooking | B．making | C．burning | D．serving |
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| 小题7: | | A．the next moment | B．for a while | C．in time | D．at once |
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| 小题8: | | A．Putting down | B．Laying aside | C．Picking up | D．Taking away |
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| 小题9: | | A．knife | B．hand | C．letter | D．key |
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| 小题10: | | A．A sad voice | B．A strange noise | C．A low shout | D．A sharp cry |
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| 小题11: | | A．key | B．kettle | C．doorlock | D．wire |
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| 小题12: | | A．followed | B．caused | C．produced | D．ended |
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| 小题13: | | A．before | B．since | C．until | D．when |
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| 小题14: | | A．surprised | B．praised | C．encouraged | D．supported |
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| 小题15: | | A．self-satisfaction | B．self-protection | C．self-respect | D．self-service |
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作用在
上，使三个物块一起沿斜面向上做匀速运动。设物体
对
的摩擦力为
，对
，下列说法正确的是（ ）
，（则C给B向下的摩擦力
）C也给A向上的摩擦力
（则A给C向下的摩擦力
）才能使三个物块一起向上匀速运动，而对C而言
才能使C向上运动，那么牛顿第三定律知，
，而