乙是A市的建材经销商，因资金周转困难，便从A市甲处借了50万元人民币，购买了一批建材

CSFB性能测试步骤（）。

A.测试车携带测试终端两台、GPS接收设备及相应的路测系统

B.测试车两台终端建立连接，一部LTE终端作为主叫，另一部LTE终端作为被叫，进行短呼语音拨打测试。每次通话时长15秒，接入超时为15秒，呼叫间隔20秒。如出现未接通或者掉话，应间隔20秒进行下一次试呼

C.测试车应视实际道路交通条件以中等速度（30km/h左右）匀速行驶，路测终端长时间保持业务

D.每分钟整分整秒时用Dumeter记录一次平均吞吐量（并截图保存），以及终端掉线情况；终端掉线时，即刻统计该时段的平均吞吐量，注明该时段的时间；掉线时停车重新建立连接后继续测试

下列描述正确的是  (    )

A．除去乙烷中的乙烯：利用发生氧化反应将混合气通过酸性高锰酸钾溶液

B．甲烷与氯气在光照条件下发生取代反应，最多可生成四种产物

C．乙醇与乙酸混合加热即能发生酯化反应生成有香味的酯

D．过程中反应①、②分别是取代反应、加成反应

女，58岁，颈部疼痛，活动受限，结合图像，最可能的诊断是()

A．颈椎退行性变

B．颈椎结核

C．椎缘骨

D．椎间盘突出

E．局限性骨化性肌炎

Scientists who discovered a new way of generating electricity from water say they may have come across an alternative source of clean energy to rival wind and solar power.

The breakthrough, which scientists say is the first new way to generate electricity in 160 years, could lead to batteries that use water instead of poisonous substances.

The scientists made the discovery when they were investigating what happens when tap water is forced through extremely narrow glass tubes. Water squeezed down the tubes, each of which was narrower than a tenth the thickness of a human hair, generating a small electric current that ran the length of the tube. To produce a larger electric current, the team tried forcing water through a glass water filter(滤水器)that contained thousands of narrow channels lined up side by side. “When we took a syringe(注射器)of water and squeezed it through the filter, we got enough power to light a light bulb,” said Larry Kostiuk of the University of Alberta in Canada. “The harder you push the syringe, the more electric current you get.”

The current is produced because of an effect in the glass tubes. When they are filled with water, positively charged ions(阳离子)fixed in the tubes are washed away, leaving a slight negative charge on the glass surface. When water is then forced along the tube, the surface repels negatively charged ions in the water while positively charged ions are attracted down the tube. The result is a net flow of positively charged ions that sets up an electric current.

According to Dr Kostiuk, no one has ever thought to use water to produce electricity in this way. “The last time someone came up with a way of generating electricity was Michael Faraday in 1839,” he said. “So this is the first new way of generating electricity in 160 years, which is why we are so excited about it.”

Dr Kostiuk says water batteries might one day be used to power mobile phones and calculators, but admitted that the engineering challenges might make other applications more realistic. “You’d need to be sure it wouldn’t leak, and you’d need to make sure it wouldn’t freeze,” he said.

More likely would be to install the electricity-generating devices where water is already being pumped, such as at city water filtration sites, he said. “It could compete with wind and solar power,” he added.

小题1:What does the passage mainly want to tell us about?

A．A kind of solar power discovered by scientists.

B．A kind of new energy source found in tap water.

C．The breakthrough to generate electricity 160 yeas ago.

D．A kind of new battery invented without poisonous substances.小题2:The underlined word “repels” in Paragraph 4 is closest in meaning to _________.

A．rejects

B．identifies

C．attracts

D．rebels小题3:Why were the scientists extremely happy about their new discovery?

A．They were the first to find a new way to produce electricity.

B．They could make an electric current to light a light bulb.

C．Their discovery could be used to invent water batteries.

D．Their discovery was made 160 years earlier than Faraday’s.小题4:What can we infer about potential water batteries?

A．They must be used to power mobile phones and calculators.

B．They have some possible disadvantages like water leaking.

C．They would be needed greatly at city water filtration sites.

D．They would be better than wind and solar power.

下列哪项不是交感神经系统的作用（）

A.瞳孔散大

B.血压升高

C.呼吸加快

D.支气管平滑肌痉挛

E.胃肠蠕动和分泌抑制