Read the following article and answer the question. Article: Learning a second language can improve brain power, scientists believe. US researchers from Northwestern University say bilingualism is a form of brain training -- a mental "work out" that adjusts the mind finely. Speaking two languages well affects the brain and changes how the nervous system reacts to sound, lab tests showed. Experts say the experiment performed by the National Academy of Sciences provides "biological" evidence of this. In an attempt to prove the guess that speaking two languages is good for one's mind, the team monitored how the brain of 48 healthy student volunteers reacted to different sounds. Twenty three of these volunteers were bilingual. The scientists used special equipment to trace the pattern of brainwaves. Under quiet, laboratory conditions, the bilingual students responded in a similar way to the English-only-speaking students, who formed the control group. But the bilingual group were far superior at processing sounds even when there were a lot of people talking in the room. They were better able to focus on to the important information -- the speaker's voice -- and block out other _ noises. Prof Nina Kraus, who led the research, said: "The bilingual's better experience with sound results in a hearing system that is highly efficient, flexible and focused in its automatic sound processing, especially in challenging or novel listening conditions." Co-author Viorica Marian said: "People do crossword puzzles and other activities to keep their minds sharp. But the advantages we've discovered in double language speakers come automatically simply from knowing and using two languages.'' Musicians appear to gain a similar benefit when rehearsing , say the researchers. According to some theories, being bilingual might help avoid dementia . Question: How was the bilingual group better at processing sounds? Answer:
OPTIONS:
- They were the control group.
- They could better fix their attention on something of importance.
- They were able to find the speaker's voice quickly.
- They had better nervous system.

Answer: They could better fix their attention on something of importance.

Read the following article and answer the question. Article: The future of agriculture must achieve several goals at the same time. First, it now appears that we will have to double world food production in the next 40 years due to population growth, increasing meat consumption and pressure from biofuels . We will also have to reduce the environmental impacts from our farming practices, which have caused widespread damage to soils, ecosystems, waters and even the atmosphere. In fact, agriculture's impacts are as bad as climate change as an environmental concern. Besides, we will have to improve food security for the world's poor. While the Green Revolution of the 1960s made it possible to feed hundreds of millions more people than in earlier eras, the number of the under-nourished in the world has started to rise again. Finally, we will have to increase the recovering ability of agriculture from shocks. Today, our high-efficiency, globalized world has many benefits, but it is vulnerable to destruction, whether from droughts, diseases or sudden price rises. We must start building better food systems to better keep us away from future shocks. Currently, there are two models of agriculture: local and organic agriculture vs. globalized and industrialized agriculture. Each has been strongly supported and severely criticized, but neither of these models, standing alone, can fully meet our needs. Organic agriculture teaches us important lessons about soils, nutrition and pest management. Unfortunately, organic food provides less than 1% of the world's calories, mostly to the wealthy. It is hard to imagine organic farming developing to feed 9 billion. Globalized and industrialized agriculture has benefits of high output and low labor demands. Without it, billions of people would have starved. However, it has come with enormous environmental and social costs, which cannot be sustained. Rather than voting for just one solution, we need a third way to solve the crisis. Let's take ideas from both sides, creating new, hybrid solutions that increase production, save resources... Question: Which is true according to the passage? Answer:
OPTIONS:
- Organic agriculture can feed most people in the world now.
- Industrialized agriculture does no harm to our environment.
- Modern farming is criticized while organic farming is not.
- The future agriculture can't only depend on organic agriculture.

Answer: The future agriculture can't only depend on organic agriculture.

Read the following article and answer the question. Article: It was not immediately clear how the military officials first spotted the activity at the site. However, the prefix = st1 /United StatesandSouth Koreagenerally share intelligence information obtained through satellite imagery. Meanwhile, more unidentified South Korean government sources said they are trying to confirm whether a new facility that has been built at the site could be part of preparations for a second nuclear test, the JoongAng Ilbo newspaper reported Saturday. Defense officials could not immediately be reached for comment. The news came a day after the South's Foreign Minister and incoming U.N. Secretary-General Ban Ki-moon met with Chinese leaders to discuss sanctions against the North over its Oct. 9 underground nuclear test. Ban met with Chinese President Hu Jintao, State Councilor Tang Jiaxuan and Foreign Minister Li Zhaoxing on Friday. South Korea's Foreign Ministry said they would discuss sanctions, but details of their talks were not immediately released. Ban is visiting the five permanent U.N. Security Council members following his election as secretary-general this month. He pledged to make resolving the North Koreanuclear issue a key priority on his agenda as head of the international body. The United Stateshas been trying to muster greater support for a U.N. Security Council resolution that calls for sanctions in response to the North's nuclear test. Seoul and Beijinghave been reluctant to enforce sanctions over the Oct. 9 test for fear they might aggravate their unpredictable neighbor and destabilize the region. As the North's main aid providers and trade partners, ChinaandSouth Korea's participation are considered crucial for the success of the United Nations resolution, which bans the sale of major arms to the North and calls for inspection of cargo entering and leaving the country. Question: It can be inferred from the passage that _ . Answer:
OPTIONS:
- the USAandSouth Koreaare quite close to each other
- North Korea and South Koreaare actually two parts of a country
- the two Koreasare proud of Ban Ki-moon
- Ban Ki-moon will take measures to start sanctions against North Korea

Answer:
the USAandSouth Koreaare quite close to each other