2022 英语第49期周报答案。

30.(10分,除注明外,每空2分)(1)氨基酸(1分)R基(1分)(2)消化、抗体、淋巴因子、蛋白类激素(写出其中2个即可)核糖体、内质网、高尔基体以及线粒体(3)蛋白质转运体前体蛋白质所携带的信号序列

第二节One possible versionDear mr. smithIm writing to ask for a three-day leave, for I can'Iattend your English classes from Monday to Wednesday nexOwing to a severe headache, I have made an appoint-ment with a specialist. and my mother will take me to seehim. It's a great pity that I will miss your interesting lessons but I hope you will excuse my absence. I promise tomake up for the missed lessons after I return to school.Your kind permission will be greatly appreciatedYeLi Hua

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