首页
登录
职称英语
[originaltext] Bows and arrows are one of man’s oldest weapons. They gave ea
[originaltext] Bows and arrows are one of man’s oldest weapons. They gave ea
游客
2023-07-30
46
管理
问题
Bows and arrows are one of man’s oldest weapons. They gave early man an effective weapon to kill his enemies. The ordinary bow or shoat bow was used by nearly all early people. This how had limited power and short range. However, man overcame these faults by learning to track his targets at a close range. The long how was most likely discovered when someone found out that a fivefoot piece of wood made a better bow than a threefood piece. Hundreds of thousands of these bows were made and used for three hundred years. However, not one is known to survive today. We believe that a force of about one hundred pounds was needed to pull the string all the way back on a long bow. For a long time the how was just a bent stick and string. In fact, more changes have taken place in a bow in the past 25 years than in the last 7 centuries. Today, bow is forceful. It is as exact as a gun. In addition, it requires little strength to draw the string. Modem bows also have precise aiming devices. In indoor contest, perfect scores from 40 yards are common. The invention of the bows itself ranks with discovery of fire and the wheel. It was a greatstepforward for ream.
选项
A、Because it was too heavy.
B、Because it did not bend easily.
C、Because it did not shoot far.
D、Because its string was short.
答案
C
解析
转载请注明原文地址:http://tihaiku.com/zcyy/2882862.html
相关试题推荐
[originaltext]SomestudentsattheOpenUniversityleftschool20yearsago
[originaltext]SomestudentsattheOpenUniversityleftschool20yearsago
[originaltext]Inrecentyears,linguists(语言学家)andlanguageteachershaveb
[originaltext]Firstofall,Iwouldliketoexplainthecoursepolicestoy
[originaltext]Firstofall,Iwouldliketoexplainthecoursepolicestoy
[originaltext]M:Hello,24thPrecinct.OfficerJonesspeaking.W:Help.Yeah,u
[originaltext]M:Hello,24thPrecinct.OfficerJonesspeaking.W:Help.Yeah,u
[originaltext]W:Hi,Mr.Adams?M:Ah,Yea.YoumustbeKelly.Thanksforcomin
[originaltext]W:Hi,Mr.Adams?M:Ah,Yea.YoumustbeKelly.Thanksforcomin
[originaltext]MikeWilsonworkedasalowrankofficialintheWarOfficed
随机试题
CompletethefollowingtableofinformationusingNOMORETHANTHREEWORDSfore
[originaltext]Ienteredhighschoolhavingreadhundredsofbooks.ButIwa
提示:Jane和Michael商量周六去野餐。他们讨论要去什么地方,带些什么。M
纤溶酶原激活物的作用是A.使纤溶酶原变为纤溶酶 B.使纤维蛋白原变为纤维蛋白原
调查质量和结果可靠性受主持人水平和技巧影响很大的方法是A.专题小组讨论 B.观
墨家的“素丝说”说明了环境对人的发展起主要作用。
案例三: 一般资料:李某,女性,17岁,高二学生。 案例介绍:李某表情惊慌,
A.氟伐他汀 B.普伐他汀 C.阿托伐他汀 D.瑞舒伐他汀 E.洛伐他汀
投资项目决策分析与评价的基本要求包括贯彻落实科学发展观、资料数据准确可靠和()
人工流产术后38天无月经,近4天下腹及肛门坠痛难忍,子宫近鸭蛋大,附件正常,首先
最新回复
(
0
)