2012骞磋伔绋�(ch膿ng)鑻辫獮(y菙)鑰冭│瑭﹂鍙婄瓟妗�-琛�(w猫i)鐢熼(l猫i)C绱�(j铆)闁辫畝鍒ゆ柗

鏇存柊鏅�(sh铆)闁擄細2015-12-10 11:50:58 渚�(l谩i)婧愶細|0

鐎忚

鏀惰棌

銆€銆€绗簩閮ㄥ垎锛氶柋璁€鍒ゆ柗(绗�16~22椤岋紝姣忛1鍒�锛屽叡7鍒�)$lesson$

銆€銆€涓嬮潰鐨勭煭鏂囧悗鍒楀嚭浜�7鍊�(g猫)鍙ュ瓙锛岃珛(q菒ng)鏍规摎(j霉)鐭枃鐨勫収(n猫i)瀹瑰皪(du矛)姣忓€�(g猫)鍙ュ瓙鍋氬嚭鍒ゆ柗;濡傛灉瑭插彞鎻愪緵鐨勬槸姝ｇ⒑淇℃伅锛岃珛(q菒ng)閬告搰A;濡傛灉瑭插彞鎻愪緵鐨勬槸閷�(cu貌)瑾や俊鎭�锛岃珛(q菒ng)閬告搰B;濡傛灉瑭插彞鐨勪俊鎭枃涓矑(m茅i)鏈夋彁鍙�锛岃珛(q菒ng)閬告搰C銆�

Tiny Invaders

銆€銆€The human body is truly amazing. It allows us to sense the world around us, to do work and have fun, and to move from place to place. In fact, the human body does its work so well that most people don't think about it very much -- until they get sick.

銆€銆€The germs(鑷寸梾鑿�)that make people sick are everywhere. You can't see them, but they're there. They're sitting on your desk. They're hiding on your computer's keyboard. They're even in the air that you are breathing. There are two types of germs: viruses and bacteria(绱�(x矛)鑿�).Viruses are germs that can only live inside animals or plants. Viruses cause illnesses such as flu and measles(楹荤柟).Bacteria are tiny creatures. Some bacteria are good. They can help your stomach break down food. Other bacteria aren't so good. They can-make you sick. Bacteria can cause sore throats(鍠夌棝)and ear infections.

銆€銆€How can you stop these tiny invaders from making you sick? Your skin is the first defense against germs. You can prevent some illnesses simply by washing, with soap and water. But germs can still enter the body through small cuts in the skin or through the mouth, eyes, and nose.

銆€銆€Once germs are inside your body, your immune(鍏嶇柅鐨�)system tries to protect you. It looks for and destroys germs. How does it do that? Special cells patrol your body. Some of these cells actually eat germs! Other cells make antibodies. An antibody sticks to a germ. There is a different antibody for each kind of germ. Some antibodies keep germs from making you sick. Others help your body find and kill germs. After a germ is destroyed, the antibodies stay in your body. They protect you if the same kind of germ comes back. That way you will not get the same illness twice.

銆€銆€You can keep your body healthy by eating a nutritious(鏈夌嚐(y铆ng)椁�(y菐ng)鐨�)diet to make your immune system strong. You can also help your immune system fight germs by getting vaccinated(鎺ョó).Vaccines are medicines. They contain germs that have been killed or weakened. The dead germs can't make you sick. Instead, they cause your body to make antibodies.If the same germ ever shows up again, then your antibodies attack it.

銆€銆€16. Viruses can only live inside people or animals.

銆€銆€銆愬弮鑰冪瓟妗堛€戯細B

銆€銆€17. All bacteria cause illnesses.

銆€銆€銆愬弮鑰冪瓟妗堛€戯細B

銆€銆€18. Washing your skin can prevent some illnesses.

銆€銆€銆愬弮鑰冪瓟妗堛€戯細A

銆€銆€19. Germs can enter the body through the eyes.

銆€銆€銆愬弮鑰冪瓟妗堛€戯細A

銆€銆€20. The heart contains the body's strongest muscle.

銆€銆€銆愬弮鑰冪瓟妗堛€戯細C

銆€銆€21. After they kill germs, antibodies stay in the body.

銆€銆€銆愬弮鑰冪瓟妗堛€戯細A