The problems are growing all the time. Americans take hundreds of millions of flights every year. More and more planes want to land and take off at the airports. There are often “traffic jams” in the sky. Accidents can easily happen. Planes are often late, and passengers get angry.

　　What can the airlines do to make flying easier? They can build bigger airports, of course. But the airports will soon be filled up with more planes. They can make flying more expensive. But then the one airline will cut price again, and all of them will have to do the same. There really isn’t an answer to the problem. Americans have always loved to travel, and they always will. The roads will go on taking more and more cars and more and more people will travel by air.

　　In America, travel by air is cheaper than it was, because ______________.

　　people have less money than before

　　the government ordered lower prices

　　the airlines want to have more passengers

　　the customers refused to accept the old prices

　　According to the writer’s opinion, there are _____ important holidays for families to gather.

　　five

　　B. three C. four

　　D. two

　　In this passage, “ traffic jams” in the third paragraph means ________.

　　condition in which many road vehicles are prevented from moving forward

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