Moving air is called wind. Sometimes the air moves very fast and causes a very strong wind. Then what causes air to move?Our Earth is surrounded(包围) by a layer of air called atmosphere(大气层). The at-mosphere surrounds the Earth completely and is about 900 kilometres thick. Within ...
【小题1】根据短文的第一句话Air is all around us可知,空气就在我们的周围,故本题答案是It is all around us。【小题2】根据短文第二段中的开头All living things need air.可知,所有的生物都需要空气。由此可知本题答案是Air。【小题3】根据短文第三段中Moving air is called wind.可知,流动的空气叫...
Which of the following statements regarding ventilation is NOT true? a. It is the process of moving air in and out of the lungs. b. Breathing in is called inhalation. c. It delivers carbon dioxide to the cells. d. Oxygen moves into the...
A. Wind is air that moves. B. Wind energy is clean and very helpful. C. Wind can't help people do any work. D. Blizzards, hurricanes or tornadoes are all strong winds.答案 1.The sun makes the wind blow.为答案提示。 2.The air over land gets hotter than ...
The small boy was lying on the street without moving. To everyone's surprise, the car didn't stop. It drove away quickly. People ran to the boy. There was a cut on the boy's head and he lost a lot of blood. The coffee shop owner (主人) telephoned the police. Soon an ambulance...
根据“Moving air—such as the wind on a breezing(微风的) day—often seems to ‘stick’ to solid objects(固体), this experiment shows.”可知,这个实验是为了表明流动的空气可能会粘在固体物体上。故选C。 (3)题详解: 推理判断题。根据“Moving air—such as the wind on a breezing(微风的) day...
(D)Moving air - such as the wind on a breezy (微风的) day - often seems to “stick" to solid objects (固体),as this experiment shows.Blow at the same level as flame.You'll need A short candle in holder▲Matches Salt box, and large container ()Look for an adult helper What to ...
The elevator started moving. Then, itdidn’t stop. Lena frowned, opening her eyes. The numbers above the doorkept changing. 11… 12… 13… Her stomach twisted. Her building only hadten floors. The elevator kept rising. ...
I missed our big family gatherings before moving here, but Mom had a(n)43heart. This year, when Mom showed me her guest list, almost half the size of our small town’s44 , I was annoyed. Our first guests arrived: ...
The elevator started moving. Then, itdidn’t stop. Lena frowned, opening her eyes. The numbers above the doorkept changing. 11… 12… 13… Her stomach twisted. Her building only hadten floors. The elevator kept rising. The air inside felt thicker,warmer, as if something unseen was breathi...