七年级上英语周报新目标2022第三单元答案

參考范文about a week later, Pomilla and Andrew got to meet her son'sSavion comilla and Andrew arrived at the metro station at theappointed time, anxiously waiting for Case to come. When Casearrived with a big smile, they felt very happy and excited. Casehugged Andrew warm-heartedly and reached out his right hand, sayingto him. Would you like to take it again?"without hesitation theboy took it and held it firmly. After talking for some time, Pomillatook out the badge and gave it back to Case. Many passengers tookictures of the sceneTaylor Pomilla was moved and expressed her thanks to Caseagain She asked Case how he could calm andrew down at that timeCase told her that he had a daughter with autism and that he hadreceived special training on how to deal with autistic children. Hepromised to visit them often to help Andrew grow up happily. As hewas talking, he took out a police badge that he made by hiimself andgave it to Andrew, who was more than happy to accept it. Ever sincethen they have been friends

解析】由设物体沿斜而运动最后H高度用时A,则sm37oatHsn37°2a(t1 1)2,解得=1,a=5H62·故总时间为2t,A项正确,B项错误;根据动能定理得△Ek=maHn3725m,C项错误;由18mgH w=△EA,解得25mH2Wi=mgH182,所以机械能损失了257m18t2mgH,D项错误。

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