问题 单项选择题

金属历来都是通过采矿、冶金制取的,可是80年代初期,科学家发现在聚乙炔中加入强氧化剂或还原剂后,它的导电性能大大提高。因为这种塑料具有金属的一般特性,所以人们称它为“人造金属”。近年来,它的发展极为神速,人们又先后研制成功了聚苯乙炔、聚苯硫醚和聚双炔类等。这种人造金属不仅具有金属光泽,还能导电传热,其用途十分引人瞩目。
“人造金属”最奇特的功能是它的导电性。与普通塑料不同的是,“人造金属”塑料具有一种独特的线型结构,许多同样的分子能奇妙地结合起来,并带有较多的“自由”电子,这就使原来的塑料改变了物理性能,能够导电。它的导电率比铜、银还要高。普通金属的导电性,随着温度的降低而增大。在接近绝对零度时成为超导,但这种低温度很难得到。而人造金属却相反,随着温度升高,外围“自由”电子释放越来越多,因此导电性增大,在常温下呈现出超导电性能。实现超导,由低温变成常温,这是人造金属创造的一大奇迹,是科学家梦寐以求的目标,用超导体制造的发电机,它的效率可以从30%提高到98%,超导电线将使远距离无损耗输电的设想成为可能.使火车悬浮在轨道上高速运行,将使控热核聚变反应成为现实,最终解决能源问题。
人造金属的另一突出贡献是,用它制成的新型电池代替笨重、硕大的铅蓄电池,可以使人们长期用蓄电池做动力汽车有了[①]的可能。人造金属电池可提供相当常规电池10倍的电力,不需要维修。充电次数可达1000次以上,使用寿命比铅蓄电池长4~5倍,而且不会污染环境。
人造金属在外压和光的作用下,能产生电场效应,把它装在扩音器上,能将声音放大;把它放在红外摄像机上,在红外热能作用下,也能产生工作电流进行录像。此外,人造金属弹性大、易加工、重量轻、耐磨蚀性能好、强度高、成本低。

在文中的[①]处填一个最适当的词语是( )。

A.希望

B.实现

C.成功

D.盼望

答案

参考答案:B

解析: 文中要填的是一个表示由未然状态向已然状态转变的词,“希望”、“盼望”都是一种心理活动,且搭配也不妥当,排除A、D。“成功”在语意衔接上不如“实现”合适。故本题答案选B。

单项选择题
阅读理解

He’s out there somewhere, an instant icon in the records of American conflict, the final big-game hunter. But a puzzle, too, his identity would be kept a secret for now, and maybe forever.

He is the unknown shooter. The nameless, faceless triggerman who put a bullet in the head of the world’s most notorious(臭名昭著的)terrorist, Bin Laden.

He’s likely between the ages of 26 and 33, says Marcinko, founder of the “SEALs Team 6” that many believe led the attack on Bin Laden in Abbottabad, Pakistan. He’ll be old enough to have had time to hurdle the extra training tests required to join the counter-terrorism unit, yet young enough to stand the body-punishing harshness of the job. The shooter’s a man, it’s safe to say, because there are no women in the SEALs. And there’s a good chance he’s white, though the SEALs have stepped up efforts to increase the number of minorities in their ranks, Marcinko and Smith say.

He was probably a high school or college athlete, Smith says, a physical specimen who combines strength, speed and wisdom. “They call themselves ‘tactical athletes,’” says Smith, who works with many future SEALs in his Heroes of Tomorrow training program in Severna Park. “It’s getting very scientific.”

Marcinko puts it in more conventional terms: “He’ll be ripped,” says the author of the best-selling autobiography “Rogue Warrior.”“He’s got a lot of upper-body strength. Long arms. Thin waist. Flat stomach.”

On this point, Greitens departs a bit. “You can’t make a lot of physical assumptions,” says the author of “The Heart and the Fist: The Education of a Humanitarian, the Making of a Navy SEAL.” There are SEALs who are 5 feet 4 and SEALs who are 6 feet 5, Greitens says. In his training group, he adds, there were college football boys who couldn’t hack it; those who survived were most often men in good shape, but they also had a willingness to show their concerns in favor of the mission.

The shooter’s probably not the crew-cut(平头), neatly shaven ideal we’ve come to expect from American fighting forces. “He’s bearded, rough-looking, like a street naughty boy,” Marcinko supposes. “You don’t want to stick out.” Marcinko calls it “modified grooming standards.”

His hands will be calloused(长老茧), Smith says, or just rough enough,” as Marcinko puts it. And “he’s got frag in him somewhere,” Marcinko says, using the battlefield shorthand for “fragments” of bullets or explosive devices. This will not have been the shooter’s first adventure. Marcinko estimates that he might have made a dozen or more deployments(部署), tours when he was likely to have dealt with quite a number of dangerous situations, getting ready any time for explosive devices or bullets.

小题1:Which of the following is most likely to be the title of the passage?

A.Who shot Bin Laden?

B.What do the SEALS do?

C.How can boys be SEALS?

D.What SEALS are like?小题2: From the passage we can know that the writer ___________.

A.knows clearly what the shooter is like

B.doubts whether Bin Laden is dead

C.is certain that the shooter is a man

D.is not sure of the shooter’s gender小题3:We can say for sure according to the passage that___________.

A.the shooter will eventually be revealed in the Press

B.the writer is a person who is curious about the shooter

C.the writer is a detective who tries to arrest the shooter

D.the shooter is a strong man with a pair of rough hands小题4:Which of the following are the names of writers mentioned in the passage?

①. Marcinko ②. Greitens ③. Smith ④. Abbottabad

A.①④

B.③④

C.②③

D.①②