在安全生产工作中�通常所说的“三违”现象是指（）。A、违反作业规程、违反操作规程、违

After he finished ______ the exciting story, he talked about it on and on with his friends.

A．reads

B．read

C．reading

D．to read

吕小姐今年30岁，就职于某外资企业，打算20年后退休，退休后每年开销的现值为4万元，退休后预计余寿30年。假设年通货膨胀率为3%，年投资报酬率在其工作期间为8%，在其退休后为4%。吕小姐计划从现在起，每年年末拿出一部分工资放入专门账户，以保证退休后的生活，则工作期间每年年末配置在退休目标上的固定储蓄的金额为（）（不考虑基本养老保险）。

A.32579元

B.38522元

C.41314元

D.57177元

Since the 1970s, scientists have been searching for ways to link the brain with computers. Brain-computer interface(BCI) technology could help people with disabilities send commands to machines.

Recently, two researchers, Jose Millan and Michele Tavella from the Federal Polytechnic school in Lausanne, Switzerland, demonstrated（展示）a small robotic wheelchair directed by a person’s thoughts.

In the laboratory, Tavella operated the wheelchair just by thinking about moving his left or right band. He could even talk as he watched the vehicle and guided it with his thoughts.

“our brain has billions of nerve ceils. These send signals through the spinal cord （脊髓）to the muscles to give us the ability to move. But spinal cord injuries or other conditions can prevent these weak electrical signals from reaching the muscles,” Tavella says.  “Our system allows disabled people to communicate with external world and also to control devices.”

The researchers designed a special cap for the user. This head cover picks up the signals from the scalp(头皮) and sends them to a computer. The computer interprets the signals and commands the motorized wheelchair. The wheelchair also has two cameras that identify objects in its path. They help the computer react to commands from the brain.                                               

Prof. Millan, the team leader, says scientists keep improving the computer software that interprets brain signals and turns them into simple commands. “The practical possibilities that BCI technology offers to disabled people can be grouped in two categories: communication, and controlling devices. One example is this wheelchair.”

He says his team has set two goals. One is testing with real patients, so as to prove that this is a technology they can benefit frotn. And the other is to guarantee that they can use the technology over long periods of time.

小题1:

BCI is a technology that can              

A．help to update computer systems

B．link the human brain with computers

C．help the disabled to recover

D．control a person's thoughts小题2:

How" did Tavella operate the wheelchair in the laboratory?

A．By controlling his muscles.

B．By talking to the machine.

C．By moving his hand.

D．By using his mind.小题3:

Which of the following shows the path of the signals described in Paragraph 5?

A．scalp→computer→cap→wheelchair

B．computer→cap→scalp→wheelchair

C．scalp→cap→computer→wheelchair

D．cap→computer→scalp→wheelchair小题4:

The team will test with real patients to

A．make profits from them

B．prove the technology useful to them

C．make them live longer

D．learn about their physical condition小题5:

Which of the following would be the best title for the text?

A．Switzerland, the BCI Research Center

B．New Findings About How the Human Brain Works

C．BCI Could Mean More Freedom for the Disabled

D．Robotic Vehicles Could Help to Cure Brain Injuries

某溶液由NaOH、HCl、稀H₂SO₄和MgCl₂中的一种或几种组成．向该溶液中滴加Ba（OH）₂溶液，产生沉淀的质量与加入Ba（OH）₂溶液体积的关系如下图所示．该溶液中不可能存在的物质是______，其理由是______

．

采煤机检修后，主油泵与马达应做（）。在进行上述各项实验时，观察外泄漏、噪声、振动及温升，不得有异常现象。

A.跑合试验；

B.满载试验；

C.超载试验；

D.泄漏试验；

E.振动试验。