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
47
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://www.tihaiku.com/zcyy/3200937.html
相关试题推荐
Peoplewhowaitforallconditionstobeperfectbeforeacting,______A、neverha
WhyhasthereturnofDiscoverybeendelayedfor24hours?[br][originaltext]
Manystudentsownacompanybeforetheirgraduation.What’syouropinionont
Nowadaysgroupsofscientificworkers,often【C1】______bytheirgovernments
Nowadaysgroupsofscientificworkers,often【C1】______bytheirgovernments
Nowadaysgroupsofscientificworkers,often【C1】______bytheirgovernments
Nowadaysgroupsofscientificworkers,often【C1】______bytheirgovernments
Nowadaysgroupsofscientificworkers,often【C1】______bytheirgovernments
Nowadaysgroupsofscientificworkers,often【C1】______bytheirgovernments
Nowadaysgroupsofscientificworkers,often【C1】______bytheirgovernments
随机试题
学龄前儿童膳食安排错误的是A.粗粮、细粮搭配 B.避免坚硬食物 C.食品多样
妊娠合并甲状腺危象的治疗方案不包括下列哪项措施A.普萘洛尔(心得安)降低心率
急性胰腺炎发病12小时以内,哪一项实验室检查诊断比较准确A.血淀粉酶 B.血脂
七情配伍中可以提高药效的是A.相杀、相反 B.相杀、相畏 C.相须、相
房屋征收方案的主要内容不包括()。A:回迁房面积 B:房屋征收目的 C:补偿
下列四项指标中,在“十一五”期间增长最快的是()。A.江苏农村居民人均纯收入
对医德良心的作用的错误提法是A.医德良心在行为前选择行为动机 B.医德良心在行
根据劳动合同法律制度的规定,下列关于不同用工形式劳动报酬结算支付周期的表述中,正
关于巷道施工设备的使用,合理的是( )。A.凿岩台车钻眼与铲斗侧卸式装岩机装矸
招标项目按照国家规定应当履行项目核准手续的,其()应当报主管部门核准,否则不能开
最新回复
(
0
)