Read the following article and select the best answer. Article: With the development of society and economy, animals and their habitats are getting pushed aside as households decrease in size and increase in number. Small numbers of people per household on average use more energy and goods per person. Greater numbers of households require more natural resources for construction. The possible result of this problem may be _ natural resources to meet consumer demand without endangering habitats important to biodiversity. Personal freedom and social choice may come at huge environmental cost. Direct costs include visible damage to animal habitats and plant life. Indirect costs include the release of more greenhouse gases. The effects of such "personal freedom and social choice" have already surfaced in south-west China's Wolong Nature Reserve. In Wolong, they found that a reduced average household size was directly tied to an increase in homes, and thus an increase in the amount of firewood consumed for cooking and heating. The rise in wood fuel use has contributed to disappearance of forests and to the loss of habitats for giant pandas. Curious about whether other parts of the world were experiencing similar phenomena, they got the support of a team of researchers including Stanford's Paul Ehrlich, well-known for his population studies, to find out the household dynamics in 141 countries between 1985 and 2000. Their study proved that the difficult choice of Wolong is part of a global trend. In the 76 countries considered biodiversity "hotspots", such as the United States, Brazil, Australia, and Kenya, the number of households grew by 3.1% every year, while the population increased just 1.8%. Meanwhile, the number of people per home dropped from 4.7 to 4.0. The decline in household size has resulted in 155 million additional households in hotspot countries, almost always limiting biodiversity. In the 10 non-hotspot countries -- those without high-density areas of animal and plant species -- similar results were found, though on a lesser scale. Even in countries experiencing... Question: What does the passage mainly talk about? - Reduced household size leads to an increase in household number. - Modern homes consume more natural resources. - How to meet consumer demand without endangering animals and their habitats. - Reduction in household size as well as increase in household number threatens nature.
Reduction in household size as well as increase in household number threatens nature.

(Question)
Read the following article and select the best answer. Article: Besides providing an ideal environment for sea plants and animals to live in, seawater has other values, one of which is that it constantly moves, and its movements produce energy. The most obvious movements are waves and the tides. Winds causes the waves, and the gravitational pull of the moon and the son causes tides. In places like the Bay of Fundy in Canada, the difference between the high and low tide level can be as much as 40 feet. France and Britain are now trying to use energy in the tides to produce electricity. Waves can produce electricity and some experiments are taking place to learn more about this. One of the most encouraging areas of research uses the difference between the temperature of seawater at the surface and deep down to produce electricity. Question: One of the values of seawater is that _ . - it has no plants in it - it pulls the sun and the moon - it flows all the time - it feeds all the time
(Answer)
it flows all the time

Ques: Read the following article and select the best answer. Article: If you are a TV addict, you can't have missed the popular sitcom Home With Kids. The lead characters, 17-year-old Xiao Xue and 14-year-old Liu Xing can remind us of our own behavior or our classmates. We love the two teenagers, but are they good students? And what makes a good student? "Being a student is a kind of occupation, so a good student should have good grades. Based on their school reports, clever and diligent, Xiao Xue is a much better student than her brother, Liu Xing," says Wu Hao, 16, Chifeng in Inner Mongolia. "The boy should work harder at studying since our duty as students is to study well." It is generally accepted that getting good scores is crucial for a student. So to some, being a good student means ranking high in your class or even your school. However, Wu also admits that a student's personality is more important in being a role model student. "Honesty and kindness make you admirable. But Xiao Xue can be selfish, dishonest and arrogant, which make others feel uncomfortable to be around her. So she has a lot yet to improve on," Wu said. Many teenagers do not think it is fair to judge students by their grades. Take Liu Xing for example. He is bright, good at computers and does everything else well like any other 14-year-old student except studying. "He is smart, humorous and always has fancy ideas which makes him popular. I guess he could be an excellent student if he attended school in the United States, where high grades are not so important and creativity is hailed," says Jia Xiaoxu, 17, Hefei, Anhui. From the US hit movie High School Musical, Jia discovers her role model. "Gabriella in the movie is an ideal student. She is ranked top but is not seen as a bookworm. She is sweet and sociable. Most importantly, Gabriella is always 'hungry' to try new things and actively participates in different kinds of activities," she said. Question: What is the passage mainly about? - A discussion about what makes a good student. - Two lovely middle school students. - How to get high rank in study. - Study and personality.
Ans: A discussion about what makes a good student.

Read the following 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: The last sentence of the passage suggests that _ . - most people suffered more than being injured - it's fortunate to land on the concrete floor - some people made jokes about his bad luck - his injury was considered not that serious
most people suffered more than being injured