1、91Do you know why different animals or insects have their special colors? Colors in them seem to be used mainly to protect themselves. Some birds like eating locusts(蝗虫）,but birds cant easily catch them. Why? It is because locusts change their colors together with the change of the colors of crops.
2、When crops are green, locusts look green. But as the harvest time comes, locusts change to the same brown color as crops have. Some other insects with different colors from plants are easily found and eaten by others, so they have to hide themselves for lives and appear only at night. If you study t
3、he animal life, you will find the main use of coloring is to protect themselves. Bears, lions and other animals move quickly through the forest. They cannot be easily seen by hunters. This is because they have the colors much like the trees. Have you ever noticed an even more strange fact? A kind of
4、 fish in the sea can send out a kind of very black liquid（液体）when it faces danger. While the liquid spreads over, its enemies cannot find it. And it immediately swims away. So it has lived up to now though it is not strong at all. 词语突破 insectnsekt n. 昆虫；卑鄙的人harvesthvst n. 收获；产量；结果 vt. 收割；得到 mainmen
5、n. 主要部分，要点；体力；总管道 adj. 主要的，最重要的；全力的send out发送；派遣；放出enemyenm n. 敌人，仇敌；敌军 adj. 敌人的，敌方的难句释疑 It is because locusts change their colors together with the change of the colors of crops. 语法突破because locusts change their colors together with the change of the colors of crops引导表语从句翻译：这是因为蝗虫随着庄稼颜色的变化而改变颜色。 So
6、me other insects with different colors from plants are easily found and eaten by others, so they have to hide themselves for lives and appear only at night.语法突破：with different colors from plants介词短语作定语。so they have to hide themselves for lives and appear only at night.是结果状语从句翻译：一些别的与植物不同颜色的昆虫很容易被其天敌
7、发现和吃掉，所以它们为了活命待躲藏起来，只在晚上出来。 So it has lived up to now though it is not strong at all.语法突破：though it is not strong at all 让步状语从句翻译：所以尽管这种鱼一点都不强壮，它能活到现在。 92 On a very hot day，it can be hard to know what to do to feel goodIf we run around，we may feel dizzy and sick to our stomachsThis is because our bo
8、dy cant get rid of the extra heatHowever，if we just sit and do nothing，we may feel restless and boredAre there things we can do to feel good when we are hot? Yes! Playing in water is one way to feel coolerOf course，people with a pool，river，lake or ocean nearby can play in the water very conveniently
9、People who dont have these can still play in water tooTaking a cool bath or shower can feel good on a hot dayOn hot days，you can lose two gallons(加仑)of water in one day，so many doctors agree that you should try to drink at least 16 glasses of water to keep the water balance in your body Mixing a lit
10、tle juice into your water is a good way to help you drink plenty of waterThe food we eat also makes a difference in how we feel in the heatCold foods，such as ice cream and drinks with some ice can cool down our bodiesFruits and vegetables are easy for the body and refreshingPlan a healthy menu for a
11、 hot day 词语突破dizzydz adj. 晕眩的；使人头晕的；昏乱的；心不在焉的； stomachsstmk n. 胃；腹部；胃口extra ekstr n. 临时演员；号外；额外的事物；上等产品 adj. 额外的，另外收费的；特大的restlessrestls adj. 焦躁不安的；不安宁的；得不到满足的convenientlyknvi:njntli adv. 便利地；合宜地menumenju n. 菜单 饭菜难句释疑：On a very hot day，it can be hard to know what to do to feel good语法突破：it can be har
12、d to know what to do to feel goodIt 形式主语 to know what to do to feel good 真正主语翻译：在炎热的一天，不知道该做些什么让自己感觉变好。This is because our body cant get rid of the extra heat语法突破：because our body cant get rid of the extra heat表语从句翻译：这是因为我们的身体不能散除额外的热。Are there things we can do to feel good when we are hot?语法突破： we
13、can do定语从句省略that/which to feel good 目的状语when we are hot时间状语从句翻译：当我们热的时候，我们能做哪些事情才能感觉好呢？On hot days，you can lose two gallons(加仑)of water in one day，so many doctors agree that you should try to drink at least 16 glasses of water to keep the water balance in your body 语法突破：so.结果状语从句 that you should try
14、 to drink at least 16 glasses of water宾语从句 to keep the water balance in your body 目的状语翻译：在热天里，每天你会流失两加仑的水，所以很多医生一致认为你应该至少喝16杯水，才能保持你身体内水的平衡。93Today Im going to talk about rainforests. Are you familiar with them? Theyre interesting and exciting places! Many kinds of the worlds plants and animals live
15、 in the rainforests.However, rainforests are in trouble nowthey are disappearing very fast because they are cut down or burnt every day. As a result, variousanimals and plants are dying out. Maybe you have never been to a rainforest, so why should you protect them with care? Rainforests are importan
16、t to everyone. They are important because the plants in the rainforests make oxygen. We need oxygen to breathe. Rainforests also help to control the weather. When trees are cut down, it gets hotter. Besides, one quarter of our medicines come from plants. Many of these plants can be found only in rai
17、nforests. There is a lot that we have not learnt about rainforests. If we destroy them, we will never find out.In my opinion, our future depends on saving the rainforests. We must tell more people how important rainforests are so that they will stop doing harm to them. We must protect the rainforest
18、s now. We have to act now to save our only home.词语突破: rainforest renfrst n. 热带雨林 variousvris adj. 各种各样的;形形色色的 die out 灭绝 oxygen ksdn n. 氧气 destroy dstr v.破坏；杀死；消灭；摧毁难句释疑: Maybe you have never been to a rainforest, so why should you protect them with care?语法突破：so why should you protect them with care
19、?是so引导的结果状语从句。翻译：也许你从来没有去过热带雨林，那为什么你应该小心地保护它们呢？We must tell more people how important rainforests are so that they will stop doing harm to them.语法突破：how important rainforests are是how引导的宾语从句作tell 的直接宾语， so that they will stop doing harm to them.是so that引导的结果状语从句。翻译：我们必须告诉人们热带雨林有多么重要，这样他们就会停止伤害它们。94Do
20、 you have brown hair? Are you taller than other kids your age? These characteristics were decided before you were born. You got your traits from your parents. They passed their traits on to you through genes(基因).Genes carry codes(代码)for blue eyes or brown eyes. Genes say how tall you will get and wh
21、at color hair you will have. You got half of your genes from your mother. You got half of your genes from your father. So you have your own set of genes. Each person gets different genes for each body part. That is why you look likebut not exactly likeyour brother or sister.A dominant(显性的)gene shows
22、 up most of the time. Brown eyes are dominant over blue eyes. A recessive(隐性的)gene shows up less often. Light hair comes from a recessive gene. Dark hair is more common. Look at the eye color and hair color of the people around you. You will see that this is true.Genes help to make you who you are.
23、But they dont tell the whole story. Your genes may help you to be fast and strong. But you still need to learn how to run or swim or skate well.词语突破：characteristics/,krktrstks/ n. 特性，特征；特色（characteristic的复数）；特质难句释疑： Genes say how tall you will get and what color hair you will have.语法突破：句中包含了how tall
24、 you will get和what color hair you will have引导的两个并列宾语从句。翻译：基因决定了你会长多高以及你头发的颜色。 That is why you look likebut not exactly likeyour brother or sister.语法突破：why you look likebut not exactly likeyour brother or sister 表语从句翻译：那也就是你长得像你的兄弟姐妹但又不完全一样的原因。95Your body is special no two people in the world are ali
25、ke. (1)Although you are different from everyone else, you have exactly the same body parts as the people around you, doing different jobs that keep all of us alive.What is inside my head?Your head houses the most valuable part of your body your brain. (2)As you are reading, your eyes send pictures t
26、o your brain which makes meaning from what you see. Your brain helps you to remember and think, and makes sure your body is doing what it should.What is my skin(皮肤) for ?Your skin covers your body. In most parts of your body, the skin is just as thick as half a centimeter. If you have your skin cut,
27、 it will have a quick cure and stop viruses from getting into your body. Your skin also helps you feel the heat and coldness of the environment around you. Hair grows from inside the skin. When you feel hot, extra heat comes out through your skin. As a result, your body temperature drops. How do I m
28、ove?Muscles(肌肉) are found in most parts of your body . They work with your bones to help you move whenever you cry or smile, eat or speak , walk or dance, etc.Why do I breathe?Your body needs to take in oxygen from the air and give out the unwanted carbon dioxide in the body. (3)When you breathe , a
29、ir comes through your nose and mouth into your lungs(肺) where oxygen flows to different parts of your body.What makes me sneeze?When dust or a strong smell gets into your nose, you sneeze. This is the way your body cleans up the dust in your nose. Your lungs push out the air and try to clear your no
30、se.What does my heart do?Your heart is a very special muscle. It is slightly bigger than your fist (拳头) and grows bigger as you do .(4) If you place your hand on your heart, you will feel your heart beating which forces blood to move around your body.词语突破：cure/kj; kj/n. 治疗；治愈；临床 疗法viruses/varsz/n. 病
31、毒 病毒；病霉（virus的复数）environment/nvarnmnt/n. 环境，外界sneeze/sniz/vi. 打喷嚏难句释疑：(1)Although you are different from everyone else, you have exactly the same body parts as the people around you, doing different jobs that keep all of us alive.语法突破：Although you are different from everyone else. Although 引导的让步状语从句
32、。that keep all of us alive. that 引导定语从句。翻译：尽管你和其他的任何人都不同，但是你和你周围的人拥有同样的身体构造，在做着不同的工作，让我们活下来。(2)As you are reading, your eyes send pictures to your brain which makes meaning from what you see.语法突破：As you are reading. As 引导的时间状语从句。which makes meaning from what you see中which 引导的定语从句。What you see中what 引
33、导宾语从句。翻译：当你阅读的时候，你的眼睛会把画面传输给大脑，然后大脑再把你所看到的画面转换成意义。(3)When you breathe , air comes through your nose and mouth into your lungs(肺) where oxygen flows to different parts of your body .语法突破：where oxygen flows to different parts of your body . where 引导的定语从句。翻译：当你呼吸时，空气通过你的鼻子和嘴进入到你的肺部，氧气再从肺部被传送到身体的不同部分。(4) If you place your hand on your heart, you will feel your heart beating which forces blood to move around your body.语法突破：If you place your hand on your heart。If引导的条件状语从句。which forces blood to move around your body. which 引导定语从句。翻译：如果你把手放在胸口，你就会感觉到心脏的不停跳动，从而迫使血液在全身流通。
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