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
2023-11-19
63
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] 【C19】
选项
A、passing
B、passed
C、has passed
D、had passed
答案
B
解析
此题考查的是“随着时间的推移”英文的固定说法。该表达是as time passes(by)。我们还要注意到后半句中用了were,就表示前面也要用过去式。因此正确答案为B项passed。
转载请注明原文地址:https://tihaiku.com/zcyy/3200955.html
相关试题推荐
Ihopeyou_____allthematerialbeforeyoumakethefinaldecision.A、willhave
Thisisthelifeofsomeonewhowrotelittle,spokelittle,andaboutwhom
Thisisthelifeofsomeonewhowrotelittle,spokelittle,andaboutwhom
Thisisthelifeofsomeonewhowrotelittle,spokelittle,andaboutwhom
WhatdidmostEuropeanscholarsbelievebefore17thcenturyaboutthesizeofth
WhatdidmostEuropeanscholarsbelievebefore17thcenturyaboutthesizeofth
Don’tcountthechickensbeforetheyare______.A、hatchedB、hitchedC、hotchedD、
Ihopeyou______allthematerialsIneedfortileclassbeforeIcomeandteac
WhichofthefollowingthingsistheoneGeorgedidfirst?[originaltext]Before
Whatisthespeaker?[originaltext]IneedtodosometextualcriticismbeforeI
随机试题
Besidesthose,whatcanweseethroughtelevision?Westillcanseepolitical___
Thereason______heexplainedtoussoundedreasonable.A、whichB、whyC、forwhic
ThehomelessmakeupagrowingpercentageofAmerica’spopulation.【C1】______
[originaltext]M:Excuseme.I’dliketobookaroomforTuesday.W:Whenwill
[originaltext]Everyyeararoundnow,tensofthousandsofDVDsofmoviesst
根据《危险化学品重大危险源辨识》中规定,危化品的危险性分级与危险控制程度分析用A
患者,女,30岁。带下量多,色黄而稠,少腹隐痛,阴部瘙痒,舌苔黄腻,脉滑数。不应
左边给定的是多面体的外表面,右边哪一项能由它折叠而成?请把它找出来。 A.如上
2020年1-12月份,全市固定资产投资3815.36亿元,同比增长6.1%。房
下列各项调查方法中不能用于推断总体的是( )。A.分层抽样 B.整群抽样
最新回复
(
0
)