英语周报2021-2022七年级上册第3期答案

,2【解析】因为f(x)=|cos2x|+cosx,所以当cos2x≥0,即一+kx≤x≤丌+kx,k∈Z时f(x)= cos 2x cos x 2cos2x +cos x-12 cos x+8,因为此时cosx∈-]u[小所以f()∈[-oy2,2,当cs82x<,即x+k

2、读后续写:(官方范文At that moment, Ruth glimpsed at the walking stick an idea striking her. Ruth droppedto her knees then lay flat on her belly as she made herself closer and closer to the edge ofthe cliff. She held the walking stick over the edge and asked judy if she could see it.Hearing a positive answer, Ruth held the stick tightly and forwarded carefully. withinminutes, Judy grabbed the other end of the stick and ruth pulled her up. Judy crawled intoher mother's lap, shaking and sweatingRuth held her dose and said anxious/y. Judy. We have to get help for Marcy/ SlowlyRuth pulled Judy to her feet, and the two women made their way back to the cabin in thedarkness. Eventually, they reached the cabin and called the emergency center. An hourlater, the rescue team arrived It took three hours to save marcy from the bottom of thecliff Rushed to the hospital for treatment of a severely broken leg, Marcy felt she was verylucky, saying, "It was Grandma's bravery and determination that saved us

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