题目内容
（请给出正确答案）
Of the following functions, which is NOT possessed by the navigation computer？
A．Showing a map of the region a driver plans to drive through.
B．Predicting a car crash on the road.
C．Getting information about road construction, weather conditions, and traffic jams.
D．Showing the car's position at all times and displaying it on the map.
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New "fake fat" products appeared on store shelves in the United States recently, but not everyone is happy about it. Makers of the products, which contain a compound called olestra, say food manufacturers can now eliminate. Critics, however, say the new compound can rob the body of essential vitamins and nutrients (营养物) and can also cause unpleasant side effects in some people. So it's up to consumers to decide whether the new fat-free products taste good enough to keep eating.
Chemists discovered olestra in the late 1960s, when they were searching for a fat that could be digested by infants more easily. Instead of finding the desired fat, the researchers created a fat that can't be digested at all.
Normally, special chemicals in the intestines(肠)"grab" molecules of regular fat and break them down so they can be used by the body. A molecule of regular fat is made up of three molecules of substances called fatting acids.
The fatty acids are absorbed by the intestines and bring with them the essential vitamins A, D, E and K. When fat molecules are present in the intestines with any of those vitamins, the vitamins attach to the molecules and are carried into the bloodstream.
Olestra, which is made from six to eight molecules of fatty acids, is too large for the intestines to absorb. It just slides through the intestines without being broke down. Manufacturers say it's the ability to slide unchanged through the intestines that makes olestra so valuable as a fat substitute. It provides consumers with the taste of regular at without any bad effects on the body. But critics say olestra can prevent vitamins A, D, E and K from being absorbed. It can also prevent the absorption of carotenoids(类胡萝卜素), compounds that may reduce the risk of cancer, heart disease, etc.
Manufacturers are adding vitamins A, D, E and K as well as carotenoids to their products now. even so, some nutritionists are still concerned that people might eat unlimited amounts of food made with the fat substitute without worrying about how many calories they are consuming.
We learn from the passage that olestra is a substance that______.
A．contains plenty of nutrients
B．renders foods calorie-free while retaining their vitamins
C．makes foods easily digestible
D．makes foods fat-free while keeping them delicious
A、Eveline loves her family despite all the problems.
B、Eveline's father does not like her boyfriend.
C、Her father used to be very kind to her.
D、She promised to her dead mother to keep the family together.
A、trans fat
B、sugars
C、protein
D、all of the above
A、an AND gate. 一个与门。
B、an OR gate. 一个或门。
C、a NAND gate. 一个与非门。
D、a NOR gate. 一个或非门。
A、technology development
B、outbound logistics
C、human resource management
D、firm infrastructure
A、backward integration
B、product development
C、forward integration
D、horizontal integration
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