英语周报八nj答案

第四部分写作第一节短文改错Last Sunday, my friend and I go to a newly-opened supermarket and each of us bought awentnotebook to be used by our English learning. After that, we went to a restaurant nearby tohaving lunch. The prices were a bit steep, but we thought it would A worth it if the fohavegood. Sadly, we were disappointing We waited for our food for over thirty minute. Ourdisappointedminutessausages were burnt and very dry that we couldn t even cut them. His friends steak was evenworse. Moreover, the carpet was out of date and worn, the chairs were very uncomfortable butthe walls needed painting I think we'll neverthere again

15.(1)(2)n2-1【解析】(1)光在水中的传播速度为分)光线在水中传播的最短时间为(1分)联立解得t=m(1分)(2)设射向水面的光发生全反射的临界角为C,则有sin C=1(1分)被光源照亮的圆形区域的半径R= han C(1分圆形区域的面积S=xR(1分)62联立解得S=(1分)

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