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书面表达【参考范文】Dear teachers and fellow students,World Environment Day is marked on June 5 every year,which aims to encourage awareness and action for the protec-tion of the environment.Every day,I go to school by bike or on foot instead oftaking the bus.At home I turn off the tap while brushing myteeth.Besides,I often donate the used textbooks to thestudents of lower grades.I believe all these steps taken canhelp lower my impact on the environment.The earth is our common home.Let's take action tobuild a better one for all of us!That's all.Thank you!

(1)解：g(x)的定义城为(0，十∞)，g'(x)=1-k=1-虹(1分)当k>0时，令g(x)>0,得0 ,故g(x)在区间(0，)上单调递增，在区间（合，十四）上单调递减。(2分)当k=1时，g(x)在区间(0,1)上单调递增，在区间(1，十∞)上单调递减，所以g(x)ax=g(1)=一1.(3分)(2(1)解：因为g(红)在区间(0，)上单调递增，在区间（后，十∞）上单调递减，所以g(x)至多有两个零点(4分)》因为g(附）=1n后-1>0，g1)=-k<0,所以g)在区同(1，专)上有-个索点.(5分)由(1)可证lnx-x≤-1<0，即lnx x2时，g(x)<0;当x1 0,所以f(x)在区间(0，x1)上单调递减，在区间(x1,x2)上单调递增，在区间(x2,十∞)上单调递减，故x1,x2为f(x)的两个极值点.(8分)f=nx-2,-1=lnz-hx-1=2n1-1.x1同理，(2=2-In x2-1.欲f(x)+f(x22_lnx+ln2-2>-1,xIx22即证lnx1十lnx2>2.(9分)因为lnx1=kx1,lnx2=kx2,所以(In z2+In z1=k(z2+1),(Inx:-In 1=k(:-x1),2+1,则nx+lnx=2·(lnx2-1m所以(10分)In'x2-In x1 x2-xI工2一1令1=>1，T1即运告n>2,即证lnt-2t-1D>0.(11分)t+12(t-1)记h(t)=lnt-t+1h'()=1、(t-1)2t(1+1)2-t+1)>0,所以h(t)在区间(1，十∞)上单调递增，所以h(t)>h(1)=0,命题得证.(12分)