问题 单项选择题

恒温恒湿型空调机在恒温运行时()。

A.制冷运行,加热不运行

B.制冷不运行,加热运行

C.制冷加热都运行

D.制冷加热都不运行

答案

参考答案:C

阅读理解

阅读理解。

    It seems that some people go out of their way to get into trouble. That's more or less what

happened the night that Nashville Police Officer Floyd Hyde was on duty.

    "I was on the way to a personal-injury accident in West Nashville. As I got onto Highway 40,

blue lights and siren (警笛) going, I fell in behind a gold Pontiac Firebird that suddenly seemed

to take off quickly down the highway. The driver somehow panicked at the sight of me. He was

going more than a hundred miles an hour and began passing cars on the shoulder."

    But Hyde couldn't go after him. Taking care of injured people is always more important than

worrying about speeders, so the officer had to stay on his way to the accident. But he did try to

keep the Firebird in sight as he drove, hoping another nearby unit would be able to step in and

stop the speeding car. As it turned out, keeping the Firebird in sightwas not that difficult. Every

turn the Pontiac made was the very turn the officer needed to get to the accident scene.

    Hyde followed the Pontiac all the way to his destination (目的地). At that point he found another

unit had already arrived at the accident scene. His help wasn't needed. Now he was free to try to

stop the driver of the firebird, who by this time had developed something new to panick about.

    "Just about that time," Hyde says, "I saw fire coming out from under that car, with blue smoke

and oil going everywhere. He's blown his engine. Now he had to stop."

    "After I arrested him, I asked him why he was running. He told me he didn't have a driver's license.

    That accident cost the driver of the Firebird plenty-a thousand dollars for the new engine-not to

mention the charges for driving without a license, attempting to run away, and dangerous driving.

1. The meaning of "panicked" in paragraph 2 is related to _____. [ ]

A. happy

B. fear

C. anger

D. hate

2. Why did the driver of the Firebird suddenly speed down the highway? [ ]

A. Because he was racing with another driver on the road.

B. Because he realized he had to hurry to the accident scene.

C. Because he thought the police officer wanted to stop him.

D. Because he wanted to overtake other cars on the shoulder.

3. The driver of the Firebird _____. [ ]

A. took a wrong turn on the way

B. had some trouble with his car

C. was stopped by the police officer

D. paid for the expenses of the accident

4. What is probably the best title for the article? [ ]

A. Losing His Way?

B. Going My Way?

C. Fun All the Way?

D. Help on the Way?

单项选择题

100年前的1898年7月,居里夫妇通过对铀矿石的研究,成功地从中分离出一种更具放射性的物质,定名为钋,几个月后,他们又发现了另一种放射性元素镭。
他们两人的这项研究工作极大地推动了物理学的发展,也极大地推动了未来这方面的实际应用。
伦琴在1895年发现了X射线,后来贝克勒耳又指出铀盐可以发出一种令人惊异的辐射。1898年初,当居里夫人在学院里就贝克勒耳射线问题进行博士论文写作的时候,她对大量的化合物和矿物进行了系统研究。当时她就注意到,有些铀的氧化物,例如沥青铀矿石的辐射要比铀本身更强。
她由此推断:这些物质,即便量极小,也可能含有一种比非化合物矿石的活性更大的元素。
此时的居里在晶体物理和磁学方面的研究已很有名气,现在他又参与进来,与居里夫人一起试图把这种未知的具有放射性的元素分离出来,并确定其属性。而且就在这时,居里夫人创造了一个新词“放射性”。
这对夫妇通过化学分离的方法,在已经获得的馏分中试图找出放射性最强的那种馏分。这项工作太枯燥乏味了:必须把馏分重新取出来,进行再处理,因为活性最大的那些成份在这些馏分中含量极少,只能通过它们具有的放射性来证明它们的存在。
他们要从数吨沥青铀矿中提取,这些矿石都是他们设法从捷克的波希米亚搞来的。
最后,在7月份,他们分离出一种新元素,居里夫人为了表示对自己祖国波兰的热爱,把这种元素定名为钋。12月份,他们终于又从这些沥青铀矿石中提取出另一种新元素镭。但是,研究工作远没有结束。
居里夫妇在一间被人冠以“巴黎物理化学学校实验室”的简陋木板房里,又用了4年时间继续在极度艰苦的条件下进行研究工作,呼吸着从装满铀矿石的大锅中散发出来的蒸汽和挥发物。1902年,他们最终成功地从里面提炼出镭,并为它确定了原子量。
1903年,居里夫人进行论文答辩,此后不久,她与丈夫及亨利·贝克勒耳去斯德哥尔摩接受诺贝尔物理学奖。在她的丈夫皮埃尔·居里因车祸去世5年后,1911年,居里夫人再次去斯德哥尔摩接受第二次诺贝尔奖,这次她获得的是化学奖。

居里夫妇发现放射性物质钋和镭的时间是______。

A.1898年
B.1895年
C.1902年
D.1903年