;  D. ad4. What do we know from the story?A. The power cuts are mainly in the north.B... won’t happen in the future.4. What do we know from the story?A. The power cuts are mainly ……

taste different things.Our sense of hearing comes from the ear.Our sense of touch happens through the skin (皮肤). Our skin feels how smooth (平滑的) things are.Choose the best answer:1. Which ……

). Adults’ bodies make about 1 percent less collagen each year. So as we get older, our skin gets... in the innermost (最里面的) layer of our skin. But as we get older, the amount of fat decreases (减少). So older ……

－ why?When we bathe our dogs, the water takes away the natural oils (天然油分) in their skin (皮肤). When this happens, the glands (腺) under their skin start making more oil. This oil attracts bacteria (细菌 ……

their skin is full of fat and collagen (胶原蛋白). When people get older, they lose a lot of fat and collagen in their skin. Their wrinkles don’t go away. They stay on their skin. When we move our ……

to men.What kind of hair do you have? Black or brown? Curly (卷曲的) or straight (直的)? Our skin color... color. When you get older, the pigment stops working. Hair will turn gray or white. You have more than ……

to men.What kind of hair do you have? Black or brown? Curly or straight? Our skin color goes.... When you get older, the pigment stops working. Hair will turn gray or white. You have more than 100 ……

at the right temperature. We can feel with our skin. Our skin can feel hot or cold. If we feel too hot, we’ll sweat (流汗) or get a red face. If we feel too cold, we’ll have goose bumps (鸡皮疙瘩) on our skin ……

at the right temperature (体温). We can feel with our skin. Our skin can feel hot or cold. If we feel too hot, we’ll sweat (流汗) or get a red face. If we feel too cold, we’ll have goose bumps (鸡皮疙瘩) on our ……

was to get up in the air and see what happens! Then we did. We got up in the air, and what happened? Nothing...’t work. We are going to jump-start them. Once we get them going, we’ll get up in the air and see what ……

break and poke (刺) us. But we don’t get hurt.Our quills can kill bacteria (细菌). This can protect us. Sometimes, our quills can break and poke (刺) us. But we don’t get hurt.Word boxWord boxhurt在句 ……

are strict about what molecules they let in and out. For example, if we inject protein or DNA directly into the body, our immune system will destroy it before it reaches the cells.To get around ……

①  Our bodies break down what we eat and drink into fuel (养分) that our bodies need to grow, move and think. This is called digestion.①  Our bodies break down what we eat and drink into fuel ……

to take a good look at ourselves, and our rooms and schoolwork and creativity, and see what we need... do they need to renew themselves?” Sarah asked.“We often need to shed our skins, those coatings ……

;  2   at first. What’s worse, our TV didn’t work. This made   3   ...;at first. What’s worse, our TV didn’t work. This made   3   3  feel ……