首页
登录
职称英语
A scientific discovery is often made 【C1】______ before someone is able to p
A scientific discovery is often made 【C1】______ before someone is able to p
游客
2024-10-24
2
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] 【C17】
选项
A、At the same time
B、On the contrary
C、For example
D、In a word
答案
C
解析
此题考查介词的用法。通过上下文看,作者在这里举例。所以正确答案为For example。因为这里不存在比较,所以,At the same time和On the contrary不可以选用。In a word(,总而言之)常用于总结,不合题意。所以,C为正确答案。
转载请注明原文地址:https://tihaiku.com/zcyy/3815515.html
相关试题推荐
Ascientificdiscoveryisoftenmade【C1】______beforesomeoneisabletop
Ascientificdiscoveryisoftenmade【C1】______beforesomeoneisabletop
Ascientificdiscoveryisoftenmade【C1】______beforesomeoneisabletop
Ascientificdiscoveryisoftenmade【C1】______beforesomeoneisabletop
Ascientificdiscoveryisoftenmade【C1】______beforesomeoneisabletop
Ascientificdiscoveryisoftenmade【C1】______beforesomeoneisabletop
Ascientificdiscoveryisoftenmade【C1】______beforesomeoneisabletop
Ascientificdiscoveryisoftenmade【C1】______beforesomeoneisabletop
Ascientificdiscoveryisoftenmade【C1】______beforesomeoneisabletop
Ascientificdiscoveryisoftenmade【C1】______beforesomeoneisabletop
随机试题
[originaltext]W:Hi,Tim.I’mreallysorrytohearaboutyourdad.Mysincerest
Comparedto______intheoffice,Katefounditmoreexcitingtoworkasateache
[originaltext]W:Hey,Mike!DidyouattendMr.Johnson’sseminarontheHistory
生态学研究的最低层次是。()A.个体 B.种群 C.群落 D.生态系
理想气体卡诺循环过程的两条绝热线下的面积大小(图中阴影部分)分别为S1和S2,则
“克汀病”是由于母亲在妊娠期缺乏( )的摄入而造成的。A.硒 B.铁
2016年1月1日,甲公司以1500万元的价格购入乙公司30%股权,能对乙公司施
HSV感染的首选药物是A.阿糖腺苷 B.金刚烷胺 C.阿昔洛韦 D.利巴韦
(2014年真题)甲公司以人民币作为记账本位币,对当月交易的外币业务采用当月月初
患者,女,23岁,2个月来时有心悸、易出汗,体重减轻约3kg。查体:血压126/
最新回复
(
0
)