2022英语周报高考外研22期答案

20.ABD解析:本题考查氢原子的跃迁。一群氢原子从能级m跃迁到基态时,能辐射出不同频率的光子数为C,A项正确;由ΔE灬=Em一E=}y可知,两个能级的能级差越大,辐射出的光子频率越高,B项正确;氢原子从n=3能级跃迁到n=4能级时将吸收0.66eV的能量,C项错误;处于n=5能级的氢原子电离时至少需要吸收0.54eV的能量,D项正确

书面表达One possible versionI求Dear PeterI heve good news for you Our school Food Club will hold a dumpling- making activity. As you're interestedin Chinese food, I'm writing to invite you to join in the activity with me.As a kind of traditional Chinese food, dumplings are very popular during festivals, especially in the SpringFestival, when people will get together to make dumplings. The activity will begin at g am next Saturday in theschool canteen. First, (chefs) will teach us how to make dumplings step by step. Then, there will be a dumplingmaking competition in groups. Finally comes the most exciting part--enyoying our dumplings.Looking forward to your coming.Your

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