A weathercock gives us the answer to this question, "Where is the wind blowing from?" We can use the wind to produce clean energy. Windmills provide people with electricity. 1. When do you feel the air on your face? 2. What do we need air to do?
【题目】Choose the best answer to complete thepassage.Have you ever wondered how a kitestays in the air? Wind is very importantbut so are two scientific words: gravity(重力)and lift(举力).When something is in the air gravity iswhat pulls something back to the ground.(1)__ you throw a...
1. You can feel the air on your face when there is wind. 2. We need air to breathe and survive. 3. You can know where the wind is blowing from by observing the direction of a weathercock. 4. Yes, air and wind are very important to us. We need air to breathe and survive. W...
1. When can we feel the air? 2. How does a balloon float in the sky? 3. Can we live without the air? 4. What can we do to protect the air? Write 30 words or more. 相关知识点: 试题来源: 解析 1. We can feel the air all the time, but we notice it most when the ...
When a pl astic bag gets caught in the wind, lift is what causes it to rise into the air. When you put a silk scarf4 a fan, lift cause s 5 to wave (). An object's lif t depends on the size of its surface or its are a. A piece of 6 will float () in the wind, but ...
When aplastic bag gets caught in the wind, lift is what causes it to rise into the air. When you put asilk scarf 6 a fan, lift causes 7 to wave(摆动). An object's lift 8 the size of itssurface or its area. A piece of 9 will float(漂浮) in the wind, 10 it won't float ...
When a plastic bag gets caught in the wind, lift is what causes it to rise into the air. When you put a silk scarf ___ a fan, lift causes ___ to wave(摆动). An object’s lift depends on the size of its surface or its area. A piece of ___will float(漂浮)in the wind, ...
surfs to the beachc. gets lower in heightd. wears a space outfit A.dcab B.dcb a C.abcd D.acbd()8. What happens to the clothes the actress throws away? A. They float in the air. B. They burn up. C. They turn into plastic. D. They fal into the ocean. 答案 B【文章大意】...
How to float a ping pong ball on air - The Coanda Effect: Directed by Dianna Cowern. With Dianna Cowern.
30.Balloonsfloatintheair___boatsdoonthesea.A.justasB.whenC.thatD.where 31.--Ifyouareofferedatriptothemoon,___it?--Ofcourse.Whynot? A.didyouaccept B.areyougoingtoaccept C.willyouaccept D.wouldyouaccept 32.Itisreportedthatmanyanewhouse___atpresentinthedisasterareaA.arebeingbuilt B.werebeing...