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要点 1：Help plants survive in cold weather.
例子 1：A kind of plants keep their flowers and leaves warm in early spring, when the weather is still cold, and its warm temperature can melt the snow.
要点 2: Help plants reproduce.
例子 2: Another plants keep themselves warm to attract insects which help carry pollen. When it is cold insects will have a rest on these flowers and in this way the plants are then pollinated.
11.防止 beach erosion 的两种方法
(1) 用混凝土等材料建筑 barrier，build construct in shallow water or near shore，这种
construct 减轻 force of the wave， decrease amount of water that reach the beach，降低被浪卷走的沙的数量；
(2) 从近海挖沙填回沙滩，比如建个泵把海里沙子抽上来，这样以后就会更多冲走新的，旧的就留下来了。
12.动物的适应性，
(1) Structure adaption。(2) Behavior adaption。
（1）Structure：指生物体进行物理变化来适应，比如在身体长出个东西来。EG：Bullhead shark。这种鲨鱼很小，经常被大鲨鱼欺负。经历N年，bullhead shark在尾巴上长出了尖刺（spike），可以抵御大鲨鱼的攻击。
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