14A【解析】本题考查原子物理学知识,目的是考查学生的理解能力。汤姆孙首先发现了电子选项A正确饱和光电流大小取决于单位时间内通过导线横截面的电荷量只要入射光的强度和频率不变单位时间内逸出的光电子数就不变饱和电流就不变选项B错误在康普顿效应中当入射光子与晶体中的电子碰撞时光子把一部分动量转移给电子光子的动量减小能量减小频率减小故光子散射后的波长变长选项C错误;比结合能越大原子核越稳定选项D错误。

书面表达One possible version:Dear Jack,I am happy to know that you are to spend some time in China. I recommend you stay in Beijing, the capital andcultural center of China.First of all, there are a lot of museums where precious relics of historical interest are waiting for you toexplore. Besides, the exceptional Peking Opera performances there are also what you can t miss. And the city isalso best known for its abundance of ancient buildings, which are still well preserved.I hope that you will have a good time in China.Yours sincerely,Li Hua

以上就是英语周报高一外研2017－2018第57期答案，更多英语周报答案请关注本网站。

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