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A Roof over Our Heads
Man has three basic needs: food, clothing, and shelter. If a man lives in a warm climate, clothing is not absolutely necessary. However, man cannot live without food, and, he has little chance of survival without shelter. Mankind needs shelter to protect him from the weather, wild animals, insects, and his enemies.
Long before man learned how to build houses, he looked for natural shelters, as the animals did. He found that he could protect himself by climbing up into trees or by crouching under the over-hanging edges of cliffs, or by crawling into caves. The first shelters or homes actually built by man were very simple. For his building materials, he used what he could find easily around him: rocks, tree branches, dried grasses, animal skins. It was a long time, however, before man began to build permanent shelters because, until man learned to farm, he lived by hunting. And, in order to follow game, he ha
A. Fish-eaters.
B. Hunters.
C. Lumbermen.
D. Farmers.
[判断题]Man has three basic needs: food, shelter and clothing.
[填空题]The Drink Your Body Needs Most
1 Our bodies are estimated to be about 60%to 70%water. Blood is mostly water. and our muscles, lungs, and brain all contain a lot of water. Water is needed to regulate body temperature and to provide the means for nutrients(滋养物)to travel to all our organs. Water also transports oxygen to our cells, removes waste, and protects our joints and organs.
2 We lose water through urination(排尿), respiration(呼吸), and by sweating. If you are very active, you lose more water than if you do not take much exercise. Symptoms of mild dehydration(脱水)include chronic pains in joints and muscles, lower back pain, headaches, and constipation(便秘). A strong smell to your urine, along with a yellow color indicates that you are not getting enough water. Thirst is all obvious sign of dehydration and in fact, you need water long before you feel thirsty.
3 A good rule of thumb(好的做法)is to take your body weight in pounds and divide that number i
[填空题]The Drink Your Body Needs Most
1 Our bodies are estimated to be about 60 to 70% water. Blood is mostly water, and our muscles, lungs, and brain all contain a lot of water. Water is needed to regulate body temperature and to provide the means for nutrients (滋养物)to travel to all our organs. Water also transports oxygen to our cells, removes waste, and protects our joints and organs.
2 We lose water through urination (排尿), respiration (呼吸), and by sweating. If you are very active, you lose more water than if you do not take much exercise. Symptoms of mild dehydration (脱水) include chronic pains in joints and muscles, lower back pain, headaches, and constipation (便秘). A strong smell to your urine, along with a yellow color indicates that you are not getting enough water. Thirst is an obvious sign of dehydration and in fact, you need water long before you feel thirsty.
3 A good rule of thumb (好的做法) is to take your body weight in pounds and divide that number in half. That
