北邮阶段作业1Before refrigerators,homes usually had ice boxes.But

北邮阶段作业1
Before refrigerators,homes usually had ice boxes.But another way to keep food cool without the need for electricity is to use an evaporative（蒸发的） cooler.This is easy to make and does not even use ice.A common design is a tall box with food placed on several shelves inside.The shelves are pieces of metal with many small holes through them.The sides of the box are covered with pieces of thick cloth.Containers of water are placed at the top and bottom of the cooler.The ends of each piece of cloth lie in the water so the cloth stays wet.Put the cooler in the open air but not in the sun.Air will pass through the wet cloth.The inside of the box will stay several degrees cooler than the outside air temperature.And this may be cool enough to keep foods fresh at least for a short time.Cold storage in a freezer,however,can keep foods in good condition for months after the growing season.Yet foods can be damaged if they are kept too cold.The British development group Practical Action says the best way to prepare foods for storage is at harvest time while still in the field.Use a sharp knife to avoid damage.Place the harvested items on a clean surface or directly into storage containers.Do not put them on the ground.Use clean water to remove dirt,and keep the water clean.Usually it is better not to remove outer leaves from fruits and vegetables before storage.Without the leaves,food can become dry.（266字） 1.Which of the following tools cannot be used to keep food cool?A.ice box B.refrigerator C.evaporative cooler D.tall box 2.According to the passage,which of the following is not true about the evaporative cooler?A.There are several shelves inside the cooler.B.The cloth covering the cooler should keep dry.C.Containers of water are placed at the top and bottom of the cooler.D.The cooler should not be put in the sun.3.Which of the following is true about the evaporative cooler?A.The outside of the cooler can be cooler than the inside.B.The cooler can keep food cool for a long time.C.The wet cloth plays an important part in the cooler.D.The cooler can be put in the sun.4.We cannot infer from the passage that________?A.the lower the temperature,the longer the food will stay fresh.B.the cleaner the food is,the better the food will be stored.C.leaves should not be removed when we store fruits.D.it is better to store foods at harvest time.5.The best title for the passage should be____?A.Ice box,Refrigerator and Evaporative cooler B.Evaporative cooler C.How to store food D.How to use cooler I

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