29． When it thunders, we always see the light before we hear the sound．______ It’s because -题库考试答案搜索网

29． When it thunders, we always see the light before we hear the sound．______ It’s because

单选题

2022-01-01 11:49

A、our eyes are in front of our ears
B、our eyes are cleverer than our ears
C、our eyes can see but our ears can-t
D、light goes faster than sound

查看答案

正确答案

D

试题解析

29.D【解析】这是一个科普常识，因为光速比声速快。

标签：

感兴趣题目

—When shall we meet again?—Make it day you like；it"s all the same to me

When we use the word（）we mean that an idea or theory is being applied: that whatever the teacher does, certain theoretical principles are always borne in mind.

We won’t load the light cargo first, will we? No, we won’t.（）

Practice 1　　No one knows what time itself is. We cannot see it. We cannot touch it. We cannot hear it. We know it only by the way we mark its passing. For all our success in measuring the tiniest parts of time, time remains one of the great mysteries of the universe.　　One way of thinking about time is to imagine a world without time. There could be no movement, because time and movement cannot be separated. A world without time could exist only as long as there were no changes. For time and change are linked. When something changes, you know time has passed.

I remembered the day when World War II finished I was eight or nine at the time , and we heard it ___ when we were at the table

I remembered the day when World War II finished I was eight or nine at the time , and we heard it ___ when we were at the table

A dog responds when it sees the following act of its owner _____.

AWhen you look at the sky at night，the moon looks bigger than the stars． In fact，the moon is much smaller than the stars．It is much smaller than the earth． But the moon is much closer to us than any star． That is why it looks so big． If you hold a coin close．to your eye，it looks big．If you look at it across the room，it looks small．The moon moves around the earth． It makes one trip in about four weeks． The moon looks flat(扁的)to us． But it is a round ball，like the earth．People once thought the moon had fire(火) on it． They thought the fire made it bright．Now we know the moon is like a mirror( 镜子 )． It gets its light from the sun Our sunlight comes from the sun，too: What is the sun? The sun is star． The stars we can see have their own light． There are many big stars we can-t see． Their light has burned out． Others are still bright，but they are so far away that we can-t see them． The sun looks bigger and much brighter than other stars because it is the nearest of all stars． The sun and the other stars we see are very hot，but the air around us saves us from(使------免于) the heat(热量) of the sun．The sun gives us light and warmth．It makes plants grow and leaves turn green． It makes life possible on our earth．It is a life-giving star．( )21． The moon looks bigger because__________ ．

A mobile offshore drilling unit must display obstruction lights when it is on the waters over the Outer Continental Shelf and is（）.

You ______ cross the road when the traffic lights are red. It’s dangerous.

A vessel is overtaking when she can see which light(s) of a vessel ahead?（）

We moved to the front row（）we could hear and see better.

相关题目: We knew we were getting close to the park _______ we started seeing the tiger right next to the road.; My parents are always warning me when I go to the concert,“Don't get off the bus ________ it is stopping.”( ); You see the lightening __________ it happens, but you hear the thunder later.; My parents are always warning me when I go to the concert,“Don\'t get off the bus ________ it is stopping.”( ); 一When can we discuss the problem?一()when we can,we must prepare foritright now．; We moved to the front row（）we could hear and see better.; BJack is a famous writer now．But he said he was not a good student when he was young．He was often late for class and didn’t like doing his homework． Sometimes he slept in class while the teacher was teaching．He didn't understand much, but he always thought he under-stood everything．．One day the teacher asked the students a question, "When John was ten years old, his brother was twenty． John is fifteen now and how old is his brother?" Jack answered, "That's easy． His brother is twice as old as John, so he is now thirty． "Another time, the teacher in a science class asked, "When it thunders(打雷) , why do we always see the light before we hear the sound? "But, Miss White," said Jack quickly, "can't you ．see our eyes are in front of our ears?"The third time, the teacher in a biology class asked, "Why can fish swim in the water?" "But, Miss White," said Jack quickly, "don't you know fish can-t walk on land?"( )26．Jack was not ________． when he was young．; When shall we meet again?—______ it any day you like， It.s all the same to me; We ran to the trees, we couldn.t see any more monkeys.; You see the lightning _____ it happens, but you hear the thunder later.; 17I remembered the day when World War II finished I was eight or nine at the time , and we heard it ___ when we were at the table; As Emerson puts it,____ we travel the world over to find the beautiful,we must carry it with us or we find it not; The question "How fast did he drive when he ran the red light?" ____ “He ran the red light”; At 0230 on 13 August，you are at mile 610.5 AHP when you see about a mile ahead lights on the water near the left bank. What might you see when you come abreast of these lights? （）; ----When shall we meet again?----（） it any day you like. It's all the same to me.; 29． When it thunders, we always see the light before we hear the sound．______ It’s because; From the text we can see that the writer seems; is the frst software we see whell we tum on the computer.; When a vessel sees the other ahead or nearly ahead，by night she could see the masthead lights of the other in a line or nearly in a line or both side lights，（）shall be deemed to exist.; As you approach mile 659.4 AHP，you see on the right descending bank a flashing green light. This light marks（）.

广告位招租WX:84302438

题库考试答案搜索网

免费的网站请分享给朋友吧