Germs are everywhere. You can"t see them, but they are on your desk, on your computer, and even in the air!Like people, germs move around the world.They fly with us on planes. When food, clothes, and other things travel around the world, germs travel, too. Some germs are safe, but some are dangerous. Germs cause illnesses like colds and the flu.Warmer Weather Brings GermsThe world"s weather is changing. Cooler places are getting warmer, so insects from hot places can movethere. Some of these insects, like mosquitoes, carry dangerous germs. These germs cause headaches, fever, and can even kill people.Under Your SkinYour skin protects you from germs. It stops some germs, but not all. They can enter your body when you eat, or when you have a cut. Germs are on your hands. They enter your body when you touch your eyes, nose, or mouth.______Your immune system also protects you. When germs get inside your body, your immune system finds and kills them. Special cells move around your body and fight germs. They help you stay healthy. Other ceils make antibodies. Antibodies help your body find and stop germs. What can you do to fight with germs Absolutely you should have some good habits in everyday life, such as washing your hands with soap and water. Soap kills many germs, and water washes them away. What do antibodies do
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Germs are everywhere. You can"t see them, but they are on your desk, on your computer, and even in the air!Like people, germs move around the world.They fly with us on planes. When food, clothes, and other things travel around the world, germs travel, too. Some germs are safe, but some are dangerous. Germs cause illnesses like colds and the flu.Warmer Weather Brings GermsThe world"s weather is changing. Cooler places are getting warmer, so insects from hot places can movethere. Some of these insects, like mosquitoes, carry dangerous germs. These germs cause headaches, fever, and can even kill people.Under Your SkinYour skin protects you from germs. It stops some germs, but not all. They can enter your body when you eat, or when you have a cut. Germs are on your hands. They enter your body when you touch your eyes, nose, or mouth.______Your immune system also protects you. When germs get inside your body, your immune system finds and kills them. Special cells move around your body and fight germs. They help you stay healthy. Other ceils make antibodies. Antibodies help your body find and stop germs. What can you do to fight with germs Absolutely you should have some good habits in everyday life, such as washing your hands with soap and water. Soap kills many germs, and water washes them away. Translate the underlined sentence in paragraph 2 into Chinese.
下列不属于蛋白质二级结构的是
A. 旷螺旋
B. 折叠
C. 右手双螺旋
D. β转角
E. 无规则卷曲
通常来说,组成动物蛋白质的氨基酸有
A. 4种
B. 22种
C. 20种
D. 19种
E. 10种
下列不能引起蛋白质变性的因素是
A. 紫外线
B. 加热
C. 酒精
D. 剧烈振荡
E. 冷冻