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
20
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] 【C16】
选项
A、of
B、from
C、for
D、with
答案
C
解析
此题考查介词的用法。这里应该选择for,表示目的,也就是applications for the laser,原因在于本文现在谈到的是科学家在思考如何应用这一新的发现。若用A项of,读者的感觉是这种应用已经存在或者出现。故C项符合题意。
转载请注明原文地址:https://tihaiku.com/zcyy/3815514.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
Beforeyoucangointoseethedoctor,pleasefillouttheseforms.Oneisfory
非编码型手动火灾报警按钮可以直接接入区域型火灾报警控制器总线回路。
仿真内窥镜成像与纤维内窥镜比较,优点是A.能进行病变组织活检 B.能检出腔内扁
(2017年真题)对于信托(契约)型股权投资基金的而言,基金份额的转让涉及(
易发生房室传导阻滞的是( )。A.下壁心肌梗死 B.正后壁心肌梗死 C.前
当采样频率为4000Hz时,电子式电流互感器的额定延时不大于()。(A)
材料在自然状态下单位体积所具有的质量称为( )。A.孔隙率 B.空隙率 C
任务中心模式把()视为社会工作者与服务对象之间进行交流的工具。A.沟通 B.鼓
国务院期货监督管理机构对期货市场实施监督管理,依法履行的职责有()。A.制定期
下列属于关系社会公共利益、公众安全的项目中,属于通信基础设施项目的有()。
最新回复
(
0
)