2021-2022年英语周报七年级下新目标41答案

解析:(1)如图所示,因为BB2,C1分别为柱的母线,所以BB1∥CC1,B1=CC从而四边形BB1C1C为平行四这形,所以D为CB1的中点,(3分)又点P为线段AB1的中点,则DP∥AC,(4分)又ACC平面AA1C,DP平面AA1C,所以DP∥平面AA1C.(5分)(2)由条件可知AC⊥BC,因为母线CC⊥底面圆O,ACC底面圆O所以CC1⊥AC,CC⊥BC,从而AC⊥平面BCCB1,西边形BCC1B1为矩形,(7分)由题知AB=2,又∠BAC=30°,所以AC=3,BC=1,因为母线长为3,所以CC1=3,(10分)所以Sn=1×3=3,所以四棱A=BCCB1的体积V=Sx,·AC-1×3×3=3.(12分)

里要讲了中文很难学。故选B[语篇解读]本文是一篇说明文,作者就如何成为一位成功的在线学习者提出了一些建议。36.F[试题解析]空前“ Many students assume thatonline classes require less work and are easier thantraditional classes."5 F. In reality, they re designedjust as demanding as traditional courses.“事实上,它们和传统课程一样要求很高”承接自然,结合语境可知空处与前句应为转折关系,故选F7.D[试题解析】根据空后“ Make sure that you have thelproper Internet connection and software programsstalled(安装)”可知,本段主要讲述要有适当的网络和软件程序,D. Be sure you have the required softwareand hardware.“确保你有要求的软件和硬件”可以作为本段中心句,故选D38.A[试题解析]空前“ During class, you arebe focused. Read and practise everything. "5 A. Golthrough every screen.“渊览每一个视频”承接自然,上下文都是讲上网课要集中注意力,不要错过任何一个选A环节39.G[试题解析]空前“ Discussion board posts, wrIttenassignments, and email are all common modes ofommunication in online courses.”与G. This isffefrom traditioclcommunication is oral.“这与传统课堂不同,传统课堂上很多交流都是口头上的”承接自然,选项中的this指代上文所说的几种在线课程交流方式,故选G。40.E[试题解析]空前“ If you have questions or don'tunderstand an assignment, tell your instructor."h EYour instructor can help you better if you tell him orher如果你告诉他或她助你”承接自然,故选E你的指导老师可以更好地帮篇解读]本文是

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