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The National Dark-Sky Week (NDSW) is a week during which people all over the United States turn off their lights to enjoy the beauty of the night sky without light pollution. This even was started by Jennifer Barlow of Midlothian, Virginia in 2003, and it is becoming more popular each year. It has been supported by the International Dark-Sky Association, the American Astronomical Society, and the Astronomical League. This even always occurs in April, during the week of the new moon so that the sky can be as dark as possible for the best viewing conditions. “It is my wish that people could see the night sky without other light in the sky as our ancestors (祖先) saw it hundreds of years ago,” explains Barlow. Since it only lasts a week and not everyone in the country will take part in it, how will the National Dark-Sky Week reduce light pollution? The main goal of NDSW is to increase awareness (意识) of the harmful effects of light pollution. It is not possible for all of the light pollution in this part of the world to disappear. However, it is possible to make a small difference in the quality of the night sky. Another goal of this even is to promote (促进) the use of better lighting systems that direct light toward the ground instead of up into the sky. Jennifer Barlow states, “The night sky is a gift of such beauty that it should not be polluted by wasted light. In this way, our children will not lose touch with the wonder of our universe.” 小题1:This passage is mainly about ______________. A.better lighting systems B.the beauty of the night sky C.the harm of light pollution D.the National Dark-Sky Week 小题2:Which of the following statements about the National Dark-Sky Week is WRONG? A.It is becoming more and more popular in America. B.The event was started in 2003 by Jennifer Barlow. C.The event takes place in the first week of every April. D.American people are supposed to turn off their lights during that week. 小题3:What is Jennifer Barlow’s wish? A.That light would be directed up into the sky. B.That the sky would always be as dark as possible. C.That people could see the night sky without light pollution as our ancestors did. D.That people could spend time enjoying the beauty of the sky every night. 小题4:We can infer from the underlined(划线的)sentence in Paragraph 4 that ________. A.many people in America hate this event B.it may be hard to reduce light pollution C.the event should last a month every year D.light will no longer pollute the sky soon 小题5:What is the main goal of the National Dark-Sky Week? A.To promote the use of better lighting systems. B.To help people realize the harm of light pollution. C.To cause all the light pollution in America to disappear. D.To help young children enjoy the wonder of our universe.
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参考答案:
举一反三
【多选题】对于夹具装置,下列说法错误的是()。
A.
斜楔夹紧楔角越小,增力作用越明显,自锁性能越好,所以楔角越小越好
B.
螺旋夹紧时采用粗牙螺纹比细牙螺纹具有更好的自锁性能
C.
偏心夹紧是一种快速高效的夹紧方法
D.
偏心夹紧自锁性能稳定,常用于工件表面误差大、加工有振动的场合
【多选题】下列有关条件电极电位的说法,正确的是()。
A.
是在特定条件下的电位,即氧化型和还原型总浓度均为Imol/L
B.
校正了各种外界因素后的实际电极电位
C.
可以通过能斯特方程式计算出来
D.
在条件不变时为一常数
【单选题】制定劳动力市场工资指导价位,首先要采集相关数据,下列说法不正确的是( )。
A.
要以随机抽样的方式收集数据
B.
收集的数据要有可比性
C.
应按照国家相关政策规定进行
D.
收集数据的范围是城镇企业
【单选题】对于常用夹紧装置,下列说法错误的是( )。
A.
斜楔夹紧时楔角越小,增力作用越明显,自锁性能越好,所以楔角越小越好
B.
螺旋夹紧机构采用粗牙螺纹比细牙螺纹具有更好的自锁功能
C.
偏心夹紧是一种快速高效的夹紧方法
D.
偏心夹紧自锁性能稳定,常用于工件表面误差大、加工有振动的场合
E.
) ①②④ (B) ①②③ (C) ②③④ (D) ①②③④
【多选题】商品经济的矛盾包括( )
A.
价值和使用价值的矛盾
B.
集体劳动和抽象劳动的矛盾
C.
私人劳动和社会劳动的矛盾
D.
生产力和科学技术的矛盾
【多选题】十进制数25用8421BCD码表示为 。
A.
0010 0101
B.
0010 0101
C.
11001
D.
100101
E.
10001
F.
01010010
G.
1111000 ‍
【单选题】8421BCD码01111000分别转换为二进制、八进制、十进制和十六进制数,下列结果正确的是:
A.
二进制数是 1111000。
B.
八进制数是 116。
C.
十进制数是 82。
D.
十六进制数是 4D。
【多选题】下列关于氧化还原电对的条件电极电位的说法正确的是 。
A.
测定条件下的标准电极电位。
B.
当有副反应发生时,电对的条件电极电势减小
C.
当有副反应发生时,电对的条件电极电势不一定减小
D.
在一定介质条件下,电对的氧化态和还原态的总浓度都为 1 mol·L -1 时校正了各种外界因素影响后的实际电极电位。
【判断题】(3,7)是开区间.
A.
正确
B.
错误
【简答题】根据课堂所学以及观看课件里地拓展资料,简述不同级别车的特点以及典型车型。并回答上课所述的宝来1.8T和奥迪A6 2.8属于什么级别的车。
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