C. here is a lot of air in the snow

　　D. the reflection of light makes it look white

　　31.How can snow protect plants from the cold?

　　A. Snow gives them much heat.

　　B. Snow contains air which has trouble moving.

　　C. Snow turns into water and waters them.

　　D. Snow makes them keep moving .

　　D

　　You may not pay much attention to your daily elevator ride. Many of us use a lift several times during the day without really thinking about it. But Lee Gray, PhD, of the University of North Carolina, US, has made it his business to examine this overlooked form of public transport. He is known as the “Elevator Guy”.

　　“The lift becomes this interesting social space where etiquette (礼仪) is sort of odd (奇怪的),” Gray told the BBC. “They（elevators）are socially very interesting but often very awkward (尴尬的) places.”

　　We walk in and usually turn around to face the door. If someone else comes in, we may have to move. And here, according to Gray, liftusers unthinkingly go through a set pattern of movements. He told the BBC what he had observed.

　　He explained that when you are the only one inside a lift, you can do whatever you want — it’s your own little box.

　　If there are two of you, you go into different corners, standing diagonally (对角线地) across from each other to create distance.

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