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f(2)=-,f)f(2)<0，故选C.4.解：由三视图可知几何体的直观图（如图）是底面为正方形的四棱锥，.该几何体的体积为V=x(3×3)×3=9,故选C.解，由有线与平面平行的定定拥知△进是，中平面与平面平行的到定定拥知B进是，有线与平面平

第二节书面表达Dear Reef,I'm more than delighted to know that you arecoming to our school to take part in the ChineseCulture Week,which will be held in the studentscenter from June 5 to June 12.There will be a variety of activities.You willlisten to lectures about Chinese culture and have achance to learn Chinese,which will help you to betterunderstand Chinese culture and make you stay in Chinaeasier.Some other activities include learning to singPeking Opera and cooking Chinese food,through whichyou will have a first-hand experience of Chineseculture.I'm sure you will enjoy an unforgettable visit.Looking forward to your arrival.Yours,Li Hua