2022七年级英语周报AHW第1期答案

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

14.B【解析】限制酶的作用部位是DNA上的磷酸二酯键,A项正确; Bamh I切割的序列与BclI切割序列不同,所以不能被BclI切割,B项错误;BclI切割形成的黏性末端与Sau3AI切割形成的黏性末端桕同,因此可通过DNA连接酶连接,C项正确;限制酶具有特异性和专一性,D项正确。

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