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
2
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/3815500.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
Educatorsknowthatteachingstudentstowritewellisnoteasy.Oneproblemi
[originaltext]W:Bob,willyoutellmesomethingaboutthenewintelligenthous
[originaltext]M:Weseemtobehavingthisconversationoverandoveragain.W:
不影响Hb与氧亲和力的因素为A.Hb量 B.2.3-DPG C.温度 D.
呕吐酸腐食物,多属()A.热伤胃肠 B.脾胃阳虚 C.热扰神明 D.
患者,男,76岁,因腹痛伴呕吐5小时入院,拟诊肠梗阻,该患者禁忌做的检查是A.X
注意事项 本题由给定资料与作答要求两部分构成。考试时限为150分钟。 监考人
关于买进看跌期权的说法(不计交易费用)正确的有()。A.看跌期权的买方的最大损
2009年1月10日,李海和王健签订《关于成立国利税务师事务所普通合伙协议》,协
在管道内作业时宜使用的手持电动工具类型是()A.0类 B.Ⅰ类 C.Ⅱ
最新回复
(
0
)