What educational class! And it is best one of all.A.a; a B.a; the C.the; the D.an; the 题目和参考答案——青夏教育精英家教网—

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What __________ educational class! And it is __________ best one of all.

A.a; a B.a; the C.the; the D.an; the

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Many people travel to different places in the world by air. Usually it takes a long time, perhaps half a day, for passengers to stay in the plane for a long time. So airlines offer passengers food. But it is common that they feel bad about food taste. Some passengers complain about the food to the airline companies , and some others even refuse to eat them. Do you agree?

To solve this problem, airlines try hard to improve their food. They would like to do so because they don’t want to lose customers.

However, according to scientific research, part of the reason why plane food tastes bad is that at high altitude we can not taste things as well as we do on the ground. Also scientists have found that our noses become very dry even before a plane takes off. As the plane moves up, the change in air pressure reduces one third of the sensibility of our taste buds（味蕾）. So our taste buds become senseless (没有知觉的). The sad fact, however, is that our noses don’t know it.

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D.Though scientists try hard, they still can’t deal with the change in air pressure successfully.

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