6B【解析】由图可知4.2()=号￥则02因为函数(x)经过点(-),由五点法得2×(-m)+9=0所以中,则函数(x)=如(2x+}该函数的最小正周期为故①错误:令2x+=+km,k∈乙,则x=百+2,k∈Z,当k=-1时3,则存在k使其对称轴为x=-3,故②正确:若x∈(3切]则2+2·6]由于y=如mx在[·6不单调递增,故③错误y=2sm2x的图象向左平移个单位得到y22(+)=2=1(2+)=/(x),故正确故选B

第三部分写作第一节【写作提示】1.审题:(1)人称:以第一、三人称为主;(2)时态:以一般过去时和般现在时为主;(3)体裁:应用文。2.写作要点:(1)比赛的基本情况(可包含时间、地点、获奖情况等);(2)感想和收获(可结合自身体会)。【参考范文A Report About a Chorus CompetitionOur school witnessed a whole campus chorus competition, whosetheme was"Beautiful CampusAs scheduled, the competition took place on the aftemoon of lastSunday in the school hall, lasting 3 hours from 2: 00 p. m. to 5:00 p. mOver 50 groups participated in this activity. They sang songs about thebeauty of the campus with enthusiasm. Class 18 in Senior 2 was eventuallyawarded first prize in the finals after fierce competitionMost of the students think highly of this singing competition, whichreally provides a platform for us to explore the beauty of our campus. Asfor me, I really feel I experienced a feast for the ears and eyes【点评】本文要点齐全,条理清晰。第一段开门见山指出学校举行了次以“美丽校园”为主题的合唱比赛。第二段第一句指出了该合唱比赛的时间和地点,接下来介绍了合唱比赛的相关情况和获奖结果。第三段讲到了大家的感想以及作者的个人感想。本文行文流畅,用词得当。在遣词造句方面,高级词汇和句式的使用使文章增色不少,sA take place, participate in, with enthusiasm, fierce competition,explore, a feast for等以及非限制性定语从句( which really provides aplatform for us to explore the beauty of our campus)、现在分词短语作状语和过去分词短语作状语( lasting3 hours from2.00p.m.o5.00pm,和As scheduled)等,增加了文章的亮点。

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