读后写Tom noticed the flame was reaching up. Frozen witfear, he stood rooted to the spot and held Jane's hatightly. Both of them were coughing heavily. Time seeto stand still, though they were probably there for onltwo or three minutes. Tom begged Jane to run for safetyas quickly as possible. Jane tried to protect her nose fithe choking smoke and shook her head. She bit againstdoor again and again.Luckilysomeneighbors passing by stoppoffered help. A sense of strength immediately replacedfear and anxiety in Jane's mind. She told them MsMakcil must be still in the room. They forced theopen with all their strength. Sure enough, Makeikinside the room, lying in bed, unconscious. Shecarried downstairs and then rushed to the hospital, whershe finally came to herself. People in the neighborhood felieved and Jane and Tom were very happy.读后写Tom noticed the flame was reaching up. Frozen witfear, he stood rooted to the spot and held Jane's hatightly. Both of them were coughing heavily. Time seeto stand still, though they were probably there for onltwo or three minutes. Tom begged Jane to run for safetyas quickly as possible. Jane tried to protect her nose fithe choking smoke and shook her head. She bit againstdoor again and again.Luckilysomeneighbors passing by stoppoffered help. A sense of strength immediately replacedfear and anxiety in Jane's mind. She told them MsMakcil must be still in the room. They forced theopen with all their strength. Sure enough, Makeikinside the room, lying in bed, unconscious. Shecarried downstairs and then rushed to the hospital, whershe finally came to herself. People in the neighborhood felieved and Jane and Tom were very happy.

7A【解析】t=t时刻,设金属杆ab的速度大小为v’,对两杆整体,由动量定理得Fto=m+mu.解得v=P-u,A正确;从t=0到=t0时间内,对金属杆ab由动量定理得BILt=BLq=mv',则通过金属杆ab的nU Ft, -mv中BL△x电荷量为q=BLBI再根据22R解得△x2(F10-mu)RB212当t=t时,两金属杆的间距2( Ftn-mu)R为s+△x=s6+B-L,B错误;通过对两金属杆进行受力分析可知,最终两金属杆以相同的加速度匀加速运动.两金属杆的速度之差为定值,C错误;根据能量守恒可得,外力F做的功等于两金属杆的动能增量和回路产生的焦耳热之和D错误。故选A。

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