题目内容：

    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.

All of these help explain why food on the plane tastes so bad. They also help explain why airlines choose to offer passengers salty and spicy food. Without doing so, the food would be tasteless.

Now there are many researches on this. According to one of them, some volunteers are asked to lie with their feet higher than their heads for weeks. And scientists write down their feelings about food taste.

Though scientists try their best, it is not as easy as they thought. Because they can’t deal with the special environment successfully, such as the change in air pressure, making food taste good is still hard for them.

1.In Paragraph 1, “complain” means ________________ in Chinese.

A.接受 B.投诉 C.讨厌 D.丢弃

2.What do airlines do to solve this problem ?

A.Get more customers. B.Offer more food.

C.Improve their food. D.Reduce the ticket price.

3.Our taste buds become senseless because of the following facts EXCEPT____________.

A.a high altitude B.the change in air pressure

C.our noses become dry D.the food goes bad in high altitude

4.Which of the following is True according to the passage?

A.Scientists have found a way to improve the plane food easily.

B.Airlines offer passengers salty and spicy food to save money

C.In the researches, some volunteers lie with their heads higher than their feet for weeks.

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

5.What is the best title of the passage?

A.Taste of Airplane Food B.Airplane Food

C.Scientific Research on Food D.Our Taste Buds in High Altitude