科学谜语

应　平

1. I can be seen most nights, sometimes you can even see me during the day. I start from nothing and grow for 14 days, and then I shrink（收缩，变小）back to nothing for 14 more days. When I am nothing I am called“new”；when I am biggest, I am called“full”.

2. Isupport life, yet sometimes I move so fast I destroy it. I carry water from the ocean to the land, depositing (存贮)it in pieces or drops. In some places I am high, in others low; in some places cold, in others warm. What am I?

3. I am poured into one end of a mysteriour (神秘的)box. something is done to me so that the box heats up while carbon dioxide(二氧化碳)and water vapour(蒸汽)come out the other end. What am I and what are they doing on me in the box?

4. I never speak unless spoken to. When questioned, I always repeat the question I would not exist if sound could not be reflected(反射).What am I?

5. A push on my short side will multiply(增加)distance. A push on my long side will multiply force. What am I?

6. I am found in many sizes and shapes,both in nature and as man-made objects. I have two different ends that are labeled(标明)like the top and bottom of the world. I am surrounded by invisible(无形的)lines and bits of iron sticks(铁棍)to me .What am I?

7. I am composed(组成)of a metal that burns at room temperature and a deadly gas. Yet without me, everyone would die. What am I?

8. My characteristics(特性，特征)include being positive(正的)，small and relatively（比较）heavy. I am surrounded by small negative particles(负粒子)moving at great speeds. What am I?

9. Closed windows and locked doors do not stop me, nor do drawn shades (幕帘)or shutters(百叶窗). I carry messages, pictures and all sorts of other information at speeds up 3,000,000 kilometers per second.What am I?

KEY：1.The moon.2.The atmosphere(空气). 3.Oil, they are burning me. 4.An echo.5.A lever(杠杆). 6. A magnet(磁铁). 7. Salt.8. Aproton(质子)in an atomic mucleus(原子核). 9. A radio wave.