2022 英语周报 八年级 AHW 24答案

16.B【解析】由题意知,杨辉三角前9行共有1+2+3+4+5+6+7+8+9=45项,故前47项的和为杨辉三角前9行的和再加第10行的前两个数1和9.所以前4项的和S:2=2+21+22+…+28+1+9=521故选B.

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

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