油中进水有哪些原因？

若函数y=3x²与直线y=kx+3的交点为（2，b），则k=（    ），b=（    ）。

和谐社会的核心是创造( )的社会。

A．民主法治、公平正义、充满活力、安定有序、人与自然和谐相处

B．民主法治、公平正义、诚信友爱、安定有序、人与自然和谐相处

C．民主法治、公平正义、诚信友爱、充满活力、安定有序、人与自然和谐相处

D．民主法治、公平正义、诚信友爱，充满活力、人与自然和谐相处

阅读理解

     A gunman killed eight people at a mall in Omaha this afternoon and then killed himself, setting off

panic among holiday shoppers, the police said.

     "The person who we believe to be the shooter has died from selfinflicted gunshot wounds," Sgt.

Teresa Negron of the Omaha Police Department said at televised news. "We have been able to clear

the mall," she said. "We don't believe we have any other shooters." The police said that at least five

other people had been injured in the shootings.

     She did not give the shooter's identity. "We are still conducting the investigation," Sergeant Negron

said, adding that the city's mayor, who was out of town, was on his way back to Omaha. She said the

police received a 911 call from someone inside the Westroads Mall on the west side of Omaha, and

shots could be heard in the background. The first police officers arrived at the mall six minutes after

the first call, she said, but by then the shootings were over.

     It is reported that the gunman left a suicide note that was found at his home by relatives. A law

enforcement official who spoke on condition of anonymity (匿名) said the note indicated that the

gunman wanted to "go out in style".

     The shootings broke the usually banal routine of holiday shopping. The gunman was said by some

witnesses to have fired about 20 shots into a crowd. Some customers and workers ran screaming from

the mall, while others dived into dressing rooms to hide from the shooter.

     Shoppers and store workers were trapped inside the mall, which has roughly 135 stores. Others

streamed out of mall exits with their hands raised. The president was in Omaha this morning to deliver

a speech, but he had left the city by the time the shootings took place.

1. Where did the news about the shooting first come out?

A. On a newspaper.  

B. On the Internet.

C. On TV.        

D. In a police poster.

2. Which of the following is TRUE according to the passage?

A. Nobody knows why the shooter did so and nothing was found at his home.

B. The city's mayor happened not to be in the city when the shooting took place.

C. Police arrived at the mall before the shootings were over and rescued customers.

D. The gunman fired two shots into a crowd.

3. We can learn from the passage that ________.

A. there is more than one shooter in this event

B. the shooting didn't trouble the customers much

C. an important holiday is coming soon

D. the president came to the scene soon after the shooting

4. Which of the following would be the best title for the news?

A. Gunman Kills 8 People, Then Himself at a Mall in Omaha

B. Shoppers in Great Panic before the Holiday

C. The President Happened to Escape a Shot

D. Shooter Found Dead in a Mall on the West of Omaha

如图所示，倾角θ=30°的斜面上，用弹簧系住一重为20N的物块，物块保持静止，已知物块与斜面间的最大静摩擦力为F_m=12N，那么该弹簧的弹力可能是

A．2N

B．10N

C．20N

D．24N

为了推动群众性爱国主义教育活动的深入开展，中宣部、中组部等11个部门联合组织了“双百”人物的评选活动。2009年9月10日，评选出了100位为新中国成立作出突出贡献的英雄模范任务和100位新中国成立以来感动中国人物。据此请回答下列各题。

之所以要开展群众性爱国主义教育活动，因为爱国主义是（）

①中 * * 精神的核心

②思想道德建设的重点

③中国人民团结奋斗的旗帜

④公民追求的最高道德目标

A.①②

B.①③

C.②④

D.③④