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1sin2x4.C[文]【解析】因为f(.[章]x)=}-tanx[来]cos"r三1+tan'x1+sin-xc[自]osr9o7in7[知]=cos2r-si[嘛]n2x=cos2x[答],且x≠吾+kx([案]kcos'x+sin'x∈Z),所以函数[网]f(x)的最小正周[文]期为π.故选C项.[章]
16.constr[来]uction17.[自]wheregent[知]ly,"Daddy,you[嘛] know I love you more than the neck-三、读后[答]续写lace.Th[案]en,the necklace slid into her father's hands de-One possible version:t[网]erminedly[文].Several days later,whe[章]n Jenny's father came in toHolding[来] the plastic pearls his daughter offered,t[自]he fa-read her story,Jen[知]ny was waiting anxiously[嘛] for him on thether dragged out a blue box.Much to Jenny's amazement[答],bed.When[案] listening[网] to the story,Jen[文]ny was totally absent-a beautiful[章] real pearl necklace lay peacefull[来]y in the box,minde[自]d,with her hands holding the necklace tightly andwhich set her heart racing.Je[知]nny froze there,a thrilled ex-firmly[嘛].When the story came to an end,unexp[答]ectedly,J[案]en-pressi[网]on twisting her face.Befo[文]re Jenny was able to sayny offered her beloved necklace to her father,wi[章]th her fin-somet[来]hing,her father brushed a warm kiss on her face andgers trembling[自] automatic[知]ally.No one knew what the neck-gath[嘛]ered her into his arms.Hold[答]ing the real necklace in herlace meant to her.She whispered[案] to her father,so[网]ftly and hand,Jenn[文]y lifted her lip,tears[章] clouding her eyes.
