半衰期为3.8天的核素是（） A．89Sr B．153Sm-EDTMP C．186R

建设项目投产运营前的准备咨询不包括（）。

A.生产经营组织咨询

B.就业影响咨询

C.经营战略咨询

D.产品市场开发分析咨询

据国家有关部门调查，目前全国至少有85%的新迁居户要装修居室。家庭居室装修成为消费热点，我国装饰业全年生产总值为500多亿元，已成为新的经济增长点。这一情况表明[ ]

A、消费决定生产的发展

B、一个新的消费热点能带动一个产业的成长

C、国家指导居民消费，才能刺激经济增长

D、国家应倡导适度消费，反对铺张浪费

洋地黄中毒所致双向性室性心动过速的机制是()

A．折返

B．触发活动

C．自律性升高

D．A、B、C三项均有可能

E．自律性降低

Recently, scientists have developed a wireless brainmachine interface that help restore communication to people who can no longer speak by reading brainwaves using electrodes(电极) stuck on their heads. Unfortunately, these have proved very slow, at roughly one word typed per minute, making normal conversations and social interactions virtually impossible.

Scientist Frank Guenther and his colleagues reveal a brainmachine interface that uses electrodes implanted directly into the brain for research into real time speech.

"It should soon be possible for extremely paralysed individuals who are incapable of speaking to produce speech through a laptop computer, " said Guenther.

The scientists worked with a 26-year- old male volunteer who experience near-total paralysis due to a stroke he suffered when he was 16. They implanted an electrode that had two wires into a part of the brain that help plan and execute movements related to speech. The electrode recorded brain signals when the volunteer attempted to talk and the wires spread them across the scalp(头皮)to help drive a speech synthesizer (合成器). The delay between brain activity and sound output was just 50 milliseconds on average, roughly the same with regular speech.

"He was quite excited, particularly on the first few days we used the system, as he got used to its properties, " Guenther recalled." I am sure the work proceeds slowly from his perspective, as it does from ours. Nonetheless, he was very excited about getting real-time audio feedback of his intended speech and happy to work very hard with us throughout the experiments."

"The current system uses data from just two wires. Within a year it will be possible to implant a system with 16 times as many." Guenther said." This will allow us to tap into neurons(神经元)，which in the end means better control over a synthesizer and thus better speech."

小题1:In the study of Guenther, electrodes are _______.

A．fixed on the heads

B．put into the heads

C．tied to the heads

D．separated from the heads小题2:   The underlined word "them" in Paragraph 4 refers to _______.

A．movements

B．wires

C．brain signals

D．Scientists小题3:   What might be the best title for the passage?

A. Wireless Device Are Used to Read Words in the Brain.

B. New Equipment Helps you read others’ mind.

C. Virtual tongue can make you speak fluently.

It is no secret what you are thinking in mind.

若不考虑地形起伏，某人从赤道出发，依次朝正东、正南、正西、正北走100千米。最后此人位于（）

A.出发点

B.出发点以西

C.出发点西北

D.出发点以东