Read the article and select the best answer. Article: Common indoor plants may prove to be a valuable weapon in the fight against rising levels of indoor air pollution. Those plants in your office or home are not only pretty, but NASA scientists are finding them to be surprisingly useful in absorbing possible harmful gases and cleaning the air inside modern buildings. NASA have announced the finds of a 2-year study that suggested the common indoor plants may provide a natural way of helping fight against "Sick Building Syndrome ". Research into the use of biological processes as a means of solving environmental problems, both on Earth and in space habitats, has been carried out for many years by Dr. Bill Wloverton, a senior research scientist at NASA. Based on preliminary evaluations of the use of common indoor plants for indoor air purification ,NASA funded a study using about a dozen popular varieties of attractive plants to determine their effectiveness in removing several key pollutants linked with indoor air pollution. NASA research on indoor has found that living plants are so efficient at absorbing pollutants in the air that some will be launched into space as part of the biological life support system aboard future orbiting space stations. While more research is needed, Wolverton says the study has shown that common indoor plants can remove certain pollutants from the indoor environment. "We feel that future results will provide an even stronger argument that common indoor plants can be a very effective part of a system used to provide pollution free homes and work places," he concludes. "Combining nature with technology can increase the effectiveness of plants in removing air pollutants," he said. NASA research has always shown that living, green and flowering plants can remove several poisonous chemicals from the air inside buildings. You can use plant in your home or office to improve the quality of the air to make it a more pleasant place to live and work--where people feel better, perform better, and enjoy life more. Question: The main idea of the passage is _ . Options: A: plants are very useful to human beings B: indoor plants can help remove indoor air pollution C: indoor plants should be raised in both homes and offices D: NASA have studied indoor plants for many years
B

Read the article and select the best answer. Article: It was the last day of my four-month interview to hold the job as a salesman in the World Trade Center -- in simpler words, an end to being perfect for four months. I took the last drop of my coffee, pushed in my chair, and said goodbye to my family -- little did they know, this could have been my final goodbye. I went to room 911, as I had the past three times, to meet my boss, Mr. Clarke. I was just about to have a seat, when suddenly I heard the sound of explosion. Then, the floor beneath my feet began shaking, which was when I began to realize that something had gone completely wrong. "Run! Let's get out of here!" Mr. Clarke cried. Seconds after the first massive explosion, I heard another explosion from way above. My heartbeat seemed to be the drum of a heavy-metal song and all the employees were rushing to get out; the lifts were out of order, and only screaming could be heard up and down the stairwell. All of us were unaware at the time that this was the airplane hitting the tower. Fire then began to swallow the walls and all you could see is gray smoke. Mr. Clarke had fallen and went unconscious. I used all my strength to throw his heavy weight on my shoulders and run down the steps. I then felt myself sinking into the floor. I ran and ran, but I was not going anywhere. The only option left was to jump. With Mr. Clarke still lying in my arms, I closed my eyes and jumped. My boss safely reached the edge of the trampoline a group of firemen held beneath us. However, I landed on the concrete floor and suffered a broken back and neck, which was considered lucky. Question: When did the author realize that something bad had happened? Options: A: After he saw the room number. B: When the floor started shaking. C: Before he said goodbye to his family. D: When fire began to swallow the walls.
B

Read the article and select the best answer. Article: People have flown kites in Japan for more than 1,000 years. There are different kinds of kites there.Some look like bats ;others look like birds. Most have pictures on them.There are many interesting stories about kites in Japan.One story tells about a thief who used a kite.He wanted to steal the gold from the top of a high tower.The thief and his friends made a large kite.One dark windy night he caught hold of the kite.His friends raised it into the air.Then they moved the kite near the top of the tower.The thief was able to steal the gold.Another story tells about a father and a son.They were in trouble on an island near Japan.The father made a large kite.His son flew in it back to Japan. The young men of Japan have kite matches.When the kites are flying, the match starts.The young men try to break each other's kite strings . The last kite left in the sky is the winner. Question: The passage mainly tells us _ . Options: A: something about the kites in Japan B: how a kite match starts C: how to fly kites D: what the kites look like
A