英语周报 2017-2018 高答案

范文Dear jackIve learned with delight that you won the first prize in the U.S. Midwest Chinese Bridge SpeechContest. Please accept my most sincere congratul ati ons and best wishes for a good futureI know how talented you are and how much hard work you' ve made to attain the goal. No onecould be more deserving of the success. And I'm very glad to hear that you owe your success to myhelp and want to study Chinese with me as well. I' m surely willing to give you a hand It's such aat encouragement to me to see your efforts rewarded. Im determined to learn English well, so cayou do me a favor to help me learn English?do hope you can take part in the final contest to be held in China and expect your furtherachievement. Looking forward to he aring from you soonYoursLi Hua范文Dear Jack,I have leaned with delight that you got the first prize in the U.S. Midwest Chinese BridgeSpeech Contest. I would like to extend to you my utmost congratul ations on your suc cess. You mustbe both excited and delighted. And I feel very happy for youIt is quite exciting news. I know this is surely owing to your hard work. It is a reward you richlydeserve. Having you as a friend, I really feel both proud and lucky because I can learn so much fromyou. I wish you would continue to help me with my English, and meanwhile I would be willing tohelp you with your Chinese as well. As we all know, you are a hard-working and talentedperson, which is essential for making achievements. I am sure that I can learn much from you, forwhich I wish you can teach me EnglishI hope that you can take part in the final contest to be held in China. I wish you would continueyour efforts and gain further success in the future. Your success tells me that hard work will pay offn the end. And your example is a constant inspiration to me. I will strug gle to catch up with youMy best wishes to your further success. Congratul ations againYLi Hua

16.(13分)(1)ACE(5分)(2)解:(i)(4分)光路如图,光在E点发生反射,光在F点发生折射,由反射定律,有∠1=∠2=30°△AEF为等边三角形,∠3=30(1分)光沿垂直AB面方向自AC面射出,有∠4=60°(1分)sin∠4该介质的折射率(1分)sIn解得√3(1分)NCi)(4分)光在介质中的传播速度vC(1分)DE= DItan∠BBC-BDEF=AEcos∠B(1分)光在介质中的传播时间DE+EF(1分)解得=1.3×10s。(1分)

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