问题 选择题
若lga,lgb是方程2x2-4x+1=0的两个实根,则ab的值等于(  )
A.2B.
1
2
C.100D.
10
答案

∵lga,lgb是方程2x2-4x+1=0的两个实根,

∴由韦达定理得:lga+lgb=-

-4
2
=2,

∴ab=100.

故选C.

完形填空
Many taxi drivers in Beijing are in a club called “Ham Radio Community(协会)”. Through the radio of the  1 , they can talk and help each other.
Chang Tong has been a Beijing taxi  2 for over ten years. He is a member of the Ham Community. He said, “Since joining the  3  ,I feel that I have a lot of friends around me while driving. It has much more fun now.”
Other members of them of the team are asas Chang Tong. A driver named Mao Lixin was saved from serious situation(处境). One night, two men  5 his taxi and told him to drive them to a far-away place. During the drive, they wanted to go to different  6 many times. Mao was afraid that  7 would happen and sent a message for help. Some member drivers got the  8 , and they drove close to Mao to follow his car. At last two men got out of the car without 9 him any money, but nothing else happened.
When one driver is in need of help,  10 from all across the city will give him or her a hand. To these taxi drivers, Ham Radio gives them some pleasure during their boring daily driving.
小题1:
A.busB.trainC.planeD.taxi
小题2:
A.teacherB.workerC.driverD.doctor
小题3:
A.schoolB.clubC.classD.team
小题4:
A.excitingB.excitedC.surprisedD.surprising
小题5:
A.droveB.ranC.stoppedD.called
小题6:
A.placesB.citiesC.police stationsD.roads
小题7:
A.bad nothingB.bad somethingC.something badD.nothing bad
小题8:
A.messageB.lettersC.booksD.telephone
小题9:
A.spendingB.takingC.sendingD.paying
小题10:
A. otherB.othersC.anotherD.the other
单项选择题