2022，2英语周报答案

第一节One possible versionear Jona,Im glad to hear from you and I' d like to share wyou something about serving chopsticksServing chopsticks are mainly used to take food fromshared dishes. You can add food to your bowl with thembut never place them into your mouth or your own bowlUsing serving chopsticks can prevent diseases from sprea-ding while we are eating together. We can alsq use them toput food into others bowls, thus creating a pleasant andharmonious dining atmosphereHoping youll come to China to experience theem afirst handYoursUa

34.(1)CDE(5分)解析:物体做受追振动时,受迫振动的物体的振幅与频率无关,A项错误;有机械振动,还必须有介质,这样才能产生机械波,B项错误;机械波的传播依赖于介质,而电磁波可以在真空中传播,C项正确;波从一种介质进入另一种介质中,其频率保持不变,D项正确;用绿色薄膜和红色薄膜各贴住双缝干涉装置中的一个缝,不能发生干涉现象,E项正确(2)解:①根据题意,进人圆锥内的光,第一次射到母线上时发生全反射后再射出,当折射率最小时恰好发生全反射,根据几何关系,有C(2分)(2分)解得23(1分)②对任意一条光线DBG,过E点作EF⊥OC,交OC于F点根据几何知识可知,线段DE连接FG=OC=√3L(2分光在圆锥内传播的时间(3分)

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