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
45
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] 【C2】
选项
A、For example
B、However
C、Nevertheless
D、Therefore
答案
A
解析
此题考查连接词的用法。作者在上一句说“科学发现很长一段时间之后,人们才能将其付诸于应用”。接下来说到“原子裂变”,这显然是在举例说明这个问题,所以正确答案只能选A项For example。因为这里没有涉及因果和转折关系,因此不能使用B项However,D项Therefore或者C项Nevertheless。
转载请注明原文地址:https://tihaiku.com/zcyy/3200938.html
相关试题推荐
Afterwemadetheimprovement,therewereonly______asbefore.A、one-tenthdefe
WhatconclusioncanwedrawaboutStevebeforehewenttothesummerschool?[or
WhichofthefollowingwasNOTattackedbeforethecrashofthehelicopter?[ori
Accordingtothenews,howmanypilotwhaleseventuallydiedbeforetheywerere
Accordingtothenews,howmanypilotwhaleseventuallydiedbeforetheywerere
Therewillbegreatdemandonyoureffortsbeforeyoureachthe______ofthera
ThereasonwhyIleftbeforethemeetingendedwas______Iwasboredbythelen
Beforereturningtohisoffice,Joehasto______.[br][originaltext]M:Ihave
Beforereturningtohisoffice,Joehasto______.[originaltext]M:Ihavetoch
WhatweretheofficialinterestratesbeforetheReserveBankofAustraliaanno
随机试题
A.accessB.accordinglyC.advocateD.automaticE.conte
火锅(hotpot)是中国的传统饮食方式之一,拥有几千年的历史。在寒冷的冬天,人们喜欢吃能立即暖身和提神的火锅。如今在许多现代家庭里,用煤炭加热的(c
不可逆抑制GABA氨基转移酶,减少GABA降解,提高脑内GABA浓度的药物是(
124.氧气瓶内的压力降到()MPa,不准再使用,用过的瓶上应写明“空瓶”。
一个长方体形状的容器,长、宽、高分别为30cm、10cm、10cm,如下图所示,
某公司为提高市场竞争力,提出了加强产品质量控制和质量检验的一系列措施。其中一个重
阅读下列史料并回答问题: 材料一 “朕临御五十年,凡举二大事,一曰西师,一曰
某女,38岁。因婚姻变故,经常心情不畅,情绪不宁,易怒喜哭,胸部满闷,咽中如有异
西咪替丁抑制胃酸分泌的机制是A.阻断H受体 B.保护胃黏膜 C.阻断H受体
属于现场质量检查方法中实测法检查的有()。A.门窗口及构件的对角线检查 B.踢
最新回复
(
0
)