2.(本题满分12分解析:(1)因为f(x)=-x2+a+1-hx,所以∫(x)=2x+a--(x>0)因为∫(x)在x=1处取得极值,所以f(1)=0,即2+a-1=0解得a=32分∫(x)=2x+3--(x>0)令∫(x)>0,即-2x+3->0,解得
用24.D细节理解题,很据第四个小标题的 Google has signed up over 10 car maker fo offer Android Auto,the作视颜聊根润第三个小标题的 but avallable only as video and only on mobilenlotalnment mystem for automobil可知, Android Auto是专为汽车设计的件,,∠段第二句 Afrer three25.C推理判断题,在美国上了三年高中之后, HayAshi决定在美国读大学,由第二yeare at an international high Achool.she decided to attend n univernity in the26,C推理判断题。外国学生可以向大学中请奖学金,由第六段第一句 Students usually ask for financial aid得出when they first apply to a univeraity得出27.A观点态度题,作者对自已在美国的留学经历持积极背定态度,由最后一段最后一句 Ba Hayashi saysthat the experlence is worth it得出8.D细节项解题
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