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完成下列各题 B Light travels at a speed which is about a million

times faster than the speed of sound．In one second，light travels about 300，000km．But sound travels only 344m．You can get some idea of this difference by watching the start of a race．If you stand some distance away from the starter，you can see smoke comes from his gun before the sound reaches your ears． This great speed of light gives US some strange facts．Sunlight takes about 8 minutes to reach US．If you look at the light of the moon tonight，remember that the light left the moon 1．3 seconds before it reached you．The nearest star is so far away that the light which you can see from it t0—night started to travel towards you four years ago at a speed of nearly 2 million km per minute．In some case，the light from one of tonight’s stars started on its journey to you before you were born． Thus，if you want to be honest，you cant say“The stars are shining to night”？You have to say“The stars look pretty．They were shining four years ago but their light has just reached Earth”． Sunlight seems to________than the light of the moon．

A.be less powerfull

B.travel much quickly

C.move less quickly

D.have to travel a greater distance

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发布时间：2021-07-10

更多“完成下列各题 B Light travels at a speed which is about a million”相关的问题

第1题

完成下列各题 A If you are writing or studyin9，it make

s very much difference where the light comes from．People who use books and pens every day have to be especially careful about the way the light shines on their work． Every house gets i ts light either from daylight through the windows--which is the very best to use--or from lamps or electricity：but whichever kind of light it is，the way it shines toward our book or work is a matter of great importance to the eyes． Take a book．sit with your back toward the window，and try to read．Your shadow(影子) falls all over the page and makes it almost as bad for your eyes as if you were in a dark room． Now turn around and face the window．The page is in the shadow again，while the bright light is in your eyes． Try sitting with you fight side toward the window．This is very well for reading，but if you were writing．the shadow of your hand would fall across the page and bother(打搅)you a little． There is just one other way：sit with your left side to the window．Now everything is perfect for reading and for writing，too． Whatever kind oi light is in the room，the rule about the right to sit is always the same． Which of the following is true？

A.How the light shines on our work is of much importance．

B.The way the light shines on your work makes no difference．

C.We needn't care about where the light comes from．

D.People can write or study under a light that comes from any direction．

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第2题

骆驼刺是一种沙漠植物，根可以扎十几米深，而地上部分只有一点点。据此完成下列各题。1.骆驼刺反映出当地自然地理环境特征是（）

A.光照强烈，地形平坦

B.植被稀少，土壤肥沃

C.气候干旱，蒸发旺盛

D.水源充足，矿物质多

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第3题

近年来，我国海洋渔获量大幅度下降，且捕上来的多是鱼子鱼孙等小鱼。据此完成下列各题。产生此现象的主要原因是（）

A.厄尔尼诺现象的产生导致气候异常

B.石油污染的结果

C.修筑人工岛和海港等设施

D.过量捕捞，使渔业资源严重衰退

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第4题

阅读下面两篇文言文，完成下列各题。【甲】杞人忧天【乙】愚公移山下列加粗词中意思和例句不相同的是例：【若】屈伸呼吸（《杞人忧天》）（）

A.[汝]之不惠（《愚公移山》）

B.曾不[若]孀妻弱子（《愚公移山》）

C.往之[女]家（《富贵不能淫》）

D.[汝]亦知射乎（《卖油翁》）

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第5题

根据下表给定逻辑关系绘制而成的某分部工程双代号网络图如下图所示，完成下列各题：(1)该网络图

根据下表给定逻辑关系绘制而成的某分部工程双代号网络图如下图所示，完成下列各题：（1)该网络图

根据下表给定逻辑关系绘制而成的某分部工程双代号网络图如下图所示，完成下列各题：

根据下表给定逻辑关系绘制而成的某分部工程双代号网络图如下图所示，完成下列各题：（1)该网络图根据下表

(1)该网络图绘制错误有()。

A、有多个起点节点B、有多个终点节点C、节点编号有误

D、工作代号重复E、有多余虚工作

(2)工作H是工作__________的平行工作，工作E的紧后工作是__________。

(3)绘制正确的双代号网络图。

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第6题

朝鲜最高人民会议常任委员会颁布政令，决定自2018年5月5日起调整标准时，采用与韩国一样的东九区区时作为标准时间（）

A.据此完成下列各题

B.17．自2018年5月5日凌晨起，朝鲜人民的钟表时间将比北京时间

C.不变

D.快一个小时

E.慢一个小时

F.慢两个小时

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第7题

下列说法不正确的是（）

A.山脉①是我国一、二阶梯的分界线

B.山脉②是昆仑山脉

C.山脉③以东是长江中下游平原，以西是四川盆地

D.图中四个省区中，有三个省区的地形以高原为主

E.读我国沿32°N纬线地形剖面图，完成下列各题

F.F

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第8题

美国特斯拉汽车公司生产的纯电动汽车，被称为汽车业的“苹果”。加强充电站建设是推动电动汽车发展的关键因素。据此完成下列各题。电动汽车充电站的选址可利用地理信息技术作综合分析，需调取的参考图层是（）①交通图 ②公共停车场分布图 ③电力网络图 ④地形图 ⑤居住区图 ⑥充电设备服务商分布图

A.①②③⑤

B.①②④⑥

C.②③④⑤

D.①③⑤⑥

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