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
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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
Which of the following does not support the statement "Yet there are some crucial ways in which Google differs from Microsoft."
A. Google is far more innovative than Microsoft.
B. Google will not be able to build Microsoft-style of monopoly on the industry.
C. Office workers are more dependent on Microsoft software than on Google.
D. Google's market share in search industry has fallen substantially.
Which of the following is implied in the sentence "Tony Blair was due on June 23rd to urge a new balance between the rights of offenders and those of victims in favour of the latter." in paragraph 3
A. The offenders should be punished more severely.
B. Tony Blair was supportive of the rights of victims.
C. Neither offenders nor victims are pleased with the status quo of the administration of justice.
D. The rights of the victims were greatly impaired.
下列选项中，属于防卫过当的情形是( )。
A. 甲用拳头打乙，乙从腰间拿出枪向甲射击却没有击中，甲吓跑了
B. 甲拿菜刀砍乙，乙加以还击一拳将甲打成重伤
C. 甲用刀砍杀乙，乙拿起身边的锄头将甲打死
D. 甲拿擀面杖打乙，乙掏出猎枪将甲打死
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