如果方程|x|=ax+1有一负根.则a的取值范围是( ).
A. a<1
B. a=1
C. a>-1
D. a<-1
E. 以上结论均不正确
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Eccentric people tend to form into groups because ______.
A. they have no other friends
B. they want others to share their interests
C. they are good organisers
D. they feel they are misunderstood
In the sentence "his successor, John Reid, is busily putting the boot into everyone else, lambasting judges for being soft on crime and scaring the daylights out of his department.", the phrase "scare the daylight out of" is closest in meaning to ______.
A. fire
B. frighten
C. scold
D. threaten
已知直线ax-by+3=0(a>0,b>0)过圆x2+4x+y2-2y-2y+1=0的圆心,则ab的最大值为().
A. 9/16
B. 11/16
C. 3/4
D. 9/8
E. 9/4
某冶金铁矿石矿山所在地为甲省,其矿山分布在甲、乙两省。2009年4月份位于甲省的矿井开采铁矿35万吨,本月销售15万吨,该矿的资源税单位税额为10元/吨;位于乙省的铁矿开采5万吨,本月销售3万吨,该铁矿的资源税单位税额为8元/吨。该矿山当月在甲省应缴纳的资源税额为( )万元。
A. 90
B. 150
C. 155
D. 157