首页
登录
职称英语
A scientific discovery is often made【C1】______ before someone is able to pu
A scientific discovery is often made【C1】______ before someone is able to pu
游客
2024-11-01
8
管理
问题
A scientific discovery is often made【C1】______ before someone is able to put it to use.【C2】______ , scientists discovered how to split atoms decades【C3】______ the invention of the atomic bomb and the use of【C4】______ power to produce electricity. But sometimes discovery and【C5】______ happen at the same time, as occurred more than thirty years ago【C6】______ the discovery of coherent light and the invention of the laser.
The word laser【C7】______ "light amplification by stimulated emission of radiation. To many people, lasers are very mysterious, but a laser is simply a【C8】______ that produces a strong light. The light from the laser is called【C9】______ light because it is light that only moves in one direction.【C10】______ , incoherent light, like the light from the sun or light from a bulb, moves away from its source【C11】______ all directions, so its strength is very spread out. The light from a laser, moving in only one direction and【C12】______ in a narrow beam, is much stronger. Laser light is created by a【C13】______ called stimulated emission. In this process, the atoms of a certain substance, such as a crystal or a gas, are excited 【C14】______ that they produce coherent light. A person working with a laser can aim this coherent light,【C15】______ a laser beam, in any direction.
As soon as the laser was developed, scientists began thinking of practical applications【C16】______ it. One of the earliest uses was to make extremely precise measurements of distance and speed.【C17】______ , the distance to the moon was measured to within a foot, and the speed of light was measured to 【C18】______ a thousandth of a mile per second. As time【C19】______ , many more applications for the laser were【C20】______ . [br] 【C10】
选项
A、On the other hand
B、In contrast
C、But
D、For example
答案
B
解析
此题考查衔接手段的应用。从上一句的coherent和这一句中的incoherent互为反义词这一点就可以看出,这两句是在比较两种不同性质的东西。所以,惟有B项In contrast正确。
转载请注明原文地址:https://tihaiku.com/zcyy/3826494.html
相关试题推荐
"let’stakeawalkbeforewestarttostudy.""Oh,Ithinkit’s_______forwalki
Ascientificdiscoveryisoftenmade【C1】______beforesomeoneisabletopu
Ascientificdiscoveryisoftenmade【C1】______beforesomeoneisabletopu
Ascientificdiscoveryisoftenmade【C1】______beforesomeoneisabletopu
Ascientificdiscoveryisoftenmade【C1】______beforesomeoneisabletopu
Ascientificdiscoveryisoftenmade【C1】______beforesomeoneisabletopu
Ascientificdiscoveryisoftenmade【C1】______beforesomeoneisabletopu
Ascientificdiscoveryisoftenmade【C1】______beforesomeoneisabletopu
Ascientificdiscoveryisoftenmade【C1】______beforesomeoneisabletopu
Ascientificdiscoveryisoftenmade【C1】______beforesomeoneisabletopu
随机试题
AmongthegreatMiddleEnglishpoets,GeoffreyChaucerisknownforhisproducti
Almosteverynewinnovationgoesthroughtherephases.Wheninitiallyintroducin
【B1】[br]【B20】A、pleasureB、propertyC、interestsD、opportunitiesA此句照应了文章首句。商人变得
Eachartistknowsinhisheartthatheissayingsomethingtothepublic.He
对自己工作中的缺点,一般情况下,你()。A.不能及时发现 B.经同事提醒后才
关于胎头径线以下说法错误的是A.临床上常用B型超声测双项径判断胎儿大小 B.双
2008年北京奥运会的主题曲是( )。A.《同一个世界同一个梦》 B.《手拉
期货公司及其从业人员在开展期货投资咨询服务时,不得从事的行为有()。A.以
下列选址条件中,不符合《生活垃圾填埋场污染控制标准》要求的是( )。A.标高高
34岁女性,入院2小时左手中指掌指关节处掌面,被宽3cm锐器刺伤,查体发现中指呈
最新回复
(
0
)