2021-2022 英语周报 八年级 4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

18.B【解析】大脑皮层言语区中,H区为听觉性语言中枢,发生障碍后,患者能听到声音,但听不懂语言A项正确;免疫活性物质包括淋巴因子、抗体和溶菌酶等淋巴因子抗体和溶菌酶的本质均为蛋白质,B项错误;细胞分裂素促进细胞分裂,成熟期喷洒定浓度的细胞分裂素溶液,可延缓叶片的黄化速度,C项正确;地球上所有生物,它们所拥有的全部基因及各种各样的生态系统共同构成生物的多样性,D项正确。

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