user: (Question)
People usually check whether their keys, wallets and phones are with them before going out . But many people in China now have one more important thing to take -- a face mask  . They hope that it can protect them from polluted air. Since January, many cities in China have seen a lot of foggy days.In Beijing, only five days in January were free of smog . It is dirty air that looks like a mixture  of fog and smoke caused mainly by smoke from cars and factories in cities. Poor air has done harm to people's health, especially for children and old people. They fall ill easily and the hospitals are full of the the patients of respiratory   problems. To respond to the air  problems, the Chinese government and many Chinese people have  started to take action. Beijing announced plans to use cle an fuel in government vehicles and plant trees. It also asked citizens to set off fewer fireworks for celebrations. Three students from No.4 High School in Beijing wrote a report to advise how to fight the air pollution. They suggested that cars with large emissions  should not be allowed to use and factories should be closely watched. We hope more people will join us in making a difference. With all our efforts , the blue skies will certainly return for good. What can people do to prevent pollution? A) use less coal than now B) cut down on energy use C) use less resources D) reduce and make full use of energy and resources
(Answer)
D


(Question)
It was a cold night. The taxi driver didn't take even one passenger all day. When he went by the railwaystation, he saw a young man coming out with two bags in his hands. So he drove to him and asked, " whereare you going ,sir? "To the Red Hotel," the young man answered. When the taxi driver heard this, he didn't feel happy anymore. The young man would give him only three dollars because the hotel was near the railway station. Butsuddenly, he had an idea. He took the young man through many streets of the big city. After a long time, they arrived at the hotel. "Here we are! You should pay me fifteen dollars, please."the taxi driver said to the young man. "What? Fifteen dollars! Do you think I'm a fool? Only last week, Itook a taxi from the railway station to this hotel and I only gave the driver thirteen dollars. I know how muchI have to pay for the trip." Maybe the taxi driver got   _  dollars at last. A) 3 B) 2 C) 13 D) 15
(Answer)
C


(Question)
Long long ago, there was a man who lived in a village.  One day, he went to a market and did some shopping. He suddenly found two boxes. Both the two boxes were very beautiful and the man fell in love with them at the first sight. So he bought them. After he got home, he didn't know how to use the boxes. He thought it over and decided to do something special. He decided to put all of his happiness in the yellow box and all of his sadness in the black box. He thought that it was funny to do that. A few days later, the yellow box was very heavy, but the black box was still light. He didn't know why. He decided to open the two boxes and found out the truth. He opened the yellow box and found nothing. Then he opened the black box and saw a hole at the bottom. Then he smiled to himself and said, "Happiness is for me. Let sadness go." A few days later, the black box was still  _  . A) light B) heavy C) big D) small
(Answer)


assistant: A