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
31
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] 【C1】
选项
A、long
B、early
C、very
D、earlier
答案
A
解析
此题考查程度副词的用法。英文词before用A项long来修饰,表示程度,意思是“早在…之前”。其他三项均不能用来修饰before。另外请注意,before long的意思是“不久”。
转载请注明原文地址:https://tihaiku.com/zcyy/3815499.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
(81)China’sburgeoningmiddleclasspopulationoffersagoodopportunityfo
TheCleanEnergyTransitionWillTransformOurEconomyBeyondRecognition
Theimagewasfascinating,asjusticeJohnPaulStevens,aChicagonative,p
[originaltext]Wedon’tknowhowthefirstfirewasmade.Earlyfiresonthe
小毛宁愿把屎拉到裤子上也不肯告诉你,你怎么办?
小明在父母离异后跟随母亲生活。某日午休时,小明在幼儿园与小朋友小刚打闹,幼儿园老
以下平面示意图中,哪一种开口位置有利于室内的自然通风?( )
某分公司财务PC通过专网与总部财务系统连接,拓扑如图8所示。某天,财务PC访
在得知客户以及拥有商业保单的情况下,理财师最恰当的做法是()。A.认真评估
-2,-2,0,4,10,()A.12 B.15 C.16 D.18
最新回复
(
0
)