[单项选择]Because the process of freezing food consumes energy, many people keep their electric freezers half-empty, using them only to store commercially frozen foods. Yet freezers that are half-empty often consume more energy than they would if they were kept fully stocked.
Which of the following, if true, contributes most to an explanation of the apparent discrepancy described above ？（）
A. A given volume of air in a freezer requires much more energy to be maintained at a temperature below freezing than does an identical volume of frozen food.
B. The more often a freezer’s door is opened, the more energy is required to maintain that freezer’s normal temperature.
C. When unfrozen foods are placed in a freezer, the average temperature of a given volume of air inside that freezer rises temporarily.
D. A person who normally maintains a half-empty freezer can cut energy costs considerably by using a freezer that is 50 percent smaller.
E. An electric freezer can operate efficiently only if chilled air is free to circulate within the freezing compartment.

[单项选择]

Many animals recognize their food because they see it. So do humans. When you see an apple or a piece of chocolate you know that these are things you can eat. You can also use other senses when you choose your food. You may like it because it smells good or because it tastes good. You may dislike some types of food because they do not look, smell or taste very nice. Different animals use different senses to find and choose their food. A few animals depend on only one of their senses, while most animals use more than one sense.
Although there are many different types of food, some animals spend their lives eating only one type. The giant panda(大熊猫) eats only one particular type of bamboo(竹子). Other animals eat only one type of food even when given the choice. A kind of white butterfly(蝴蝶)will stay on the leaves of a cabbage, even though there are plenty of other vegetables in the garden. However, most animals have a more varied diet(多样化饮食). The bear eats fruits and fish. T
A. depend on one sense in choosing food
B. are not satisfied with their food
C. choose food in similar ways
D. eat entirely different kinds of food

[单项选择]A. Food chains have been seriously damaged because of weather.
B. Climate change leads to the change of food production patterns.
C. The increasing speed of flowering is beyond scientists’ expectation.
D. Plants’ reaction to weather could have damaging effects on ecosystem.

[填空题]Genetic engineering (GE) of food is a risk process. Current (81) understanding of genetics is extremely limited but scientists do (82) not know the long-term effects of releasing these predictable (83) foods into our environment and our diets. Yet, GE ingredients is (84) freely entering our food without sufficient regulations and without the consent and knowledge of consumer. (85) Although transnational companies and their political supporters want we to believe that GE food is safe and (86) thoroughly tested, but growing awareness to the dangers from it (87) has started a global wave of rejection by consumers, fanners and food companies in many of the world’s largest food markets. Due to consumer pressure, supermarkets have taken GE food from (88) their shelves, global food companies have removed GE ingredients to their products an

[简答题]Children, especially, love fast food because it’s finger food, no struggling with knives and forks, no annoying instructions from adults about table manners.

[单项选择]Because of the limited time, he swallowed the food and hurried to the work place.
A. fastened
B. engulfed
C. hurried
D. quickened

[单项选择]

Because humans are at the top of the food chain, they are particularly vulnerable to the effects of nondegradable (不可能降解的)pollutants. This was clearly illustrated in the 1950s and 1960s when residents living near Minamata Bay, Japan, developed nervous disorders, shaking, and paralysis(瘫痪，麻痹) in a mysterious widespread. Over 400 people died before authorities discovered that a local industry had released mercury(水银，汞) into Minamata Bay. This highly toxic element stored up in the bodies of local fish and eventually in the bodies of people who consumed the fish. More recently research has revealed that many chemical pollutants are harmful to the human beings.
Pollution also has a dramatic effect on natural resources. Ecosystems such as forests, wetlands, and rivers perform many important services for the earth’s environment. They improve water and air quality, provide living places for plants and animals, and provide food and medicines. Any or all of these ecos
A. cloak
B. guard
C. defend
D. protect