题目内容
A few degrees can make a big difference when it comes to food storage. Foods can go bad if they get too warm. But for many of the world’s poor, finding a good way to keep food cool is difficult. Refrigerators are costly and they need electricity.
Yet spoiled food not only creates health risks but also economic losses. Farmers lose money when they have to throw away products that they can not sell quickly.
But in 1995, a teacher in northern
The space between the two pots is filled with wet sand. The inner pot can be filled with fruit, vegetables or drinks. A piece of wet cloth covers the whole cooling system.
Food stored in the smaller pot is kept from spoiling through a simple evaporation (蒸发) process. Water in the sand between the two pots evaporates through the surface of the larger pot, where drier outside air is moving.
The evaporation process creates a drop in temperature of several degrees. This cools the inner pot and helps keep food safe from harmful bacteria. Some foods can be kept fresh this way for several weeks.
People throughout
In 2000, the Rolex Watch Company of
A committee considers projects in science and medicine, technology, exploration and discovery, the environment and cultural history. Winners receive financial assistance to help develop and extend their projects.
The award is given every two years. The next one will be given in 2008.
77. According to the text, why will the food in the inner pot not go bad?
A. The temperature is lower than the outside.
B. Both of the pots are made of clay.
C. It is covered with a wet cloth.
D. Drier air is moving outside the pots.
78. What makes foods go bad if they get too warm according to the text?
A. The water in the food. B. The air around the food.
C. The harmful bacteria. D. The writer doesn’t mention it.
79. Rolex Watch Company gave Mohammed Bah Abba an award because ______________ .
A. he saved lots of energy like electricity
B. he made a contribution to common people
C. he was more than a good teacher
D. he made a great discovery in Africa
80. From the text we can infer this article was probably written in _______________.
A. 1995 B. 2000 C. 2004 D. 2007
阅读下面短文，将标有A~F的段落或句子插入文章中题号为1~5的恰当位置，使全篇文章意义完整，结构连贯。注意：1)有一个选项是多余的；2)如选E请填涂AB；选F请填涂CD.
Freezing can keep food fresh and safe to eat. Freezing lowers the food temperature below zero degree Celsius. That is the point where water turns to ice. 1. , it is important to lower the temperature to between minus fifteen and minus twenty degrees Celsius as quickly as possible. The faster the freezing process is, the fresher the taste of the food.
Fruits and vegetables can be spread out inside the freezer. Once the food is frozen, 2. . Fruits are usually not cooked before they are frozen. This allows them to keep their fresh taste. The simplest way to prepare fruits is to cut them up and place them in a container inside the freeze before putting it in the container. This will keep it from sticking to the container. This is called the “dry pack” method.
3. , The fruit is prepared along with some of its liquid or juice. You can ad some sugar to fruits that are naturally juicy. The sugar sweetens the fruit and brings out its natural juices.
4. . Blanching means placing the vegetables in boiling water for a few minutes and then quickly placing them into very cold water. Blanching slows down the natural chemical aging process. All extra water should be removed before placing the vegetables into containers and freezing. 5. .
|
A．it should be placed in containers and then stored at a temperature of about minus twenty degrees Celsius |
|
B．Vegetables are either cooked or blanched before freezing |
|
C．To start the freezing process |
|
D．To keep them fresh for a long time |
E. The second way is the “wet pack” method
F. Most foods can be stored frozen for up to one year