Ques:Read the following article and select the best answer. Article: Could smells affect your lifespan? Female fruit flies rid of the ability to smell food outlive their peers.The sense of smell may be linked to the cellular ageing process in many other organisms--even people.A link has recently been found between sensory experiences and lifespan in both worms and flies.For example, Scott Pletcher, a biologist at the University of Michigan, found that eliminating fruit flies' ability to smell enabled them to live nearly 20 percent longer than flies with an intact sense of smell. Pletcher's team reasoned that food smells were the ones most likely to affect ageing, as nutrition and longevity are known to be linked in many organisms.To test the idea that food odors affect lifespan, Pletcher's team eliminated flies' ability to smell carbon dioxide, which is produced by some fly foods.They left the rest of the smelling system intact. This intervention had no effect on male flies, but the females lived 30 percent longer than normal.Pletcher thinks eliminating the ability to smell CO2may deprive flies of information about food availability.This could signal to cells that food is scarce, causing processes that promote survival.Indeed, his team found that the CO2-insensitive female flies stored extra fat and that both males and females immune to CO2were more resistant to stress than normal flies.Pletcher isn't sure why the change in his fruit flies only affected the lifespan of the females, but he suggests that females may simply be more sensitive to the odor of CO2. A smell or taste that stretches lifespan in humans could be a potential preventative for age-related disease, he adds.Although in fruit flies it appears to be the smell of CO2that affects ageing, he says that an analogue in humans might be a smell or taste linked to human food--or a lack of it.Matt Kaeberlein studies ageing at the University of Washington in Seattle. He cautions that we don't know whether ageing and smell are linked in mammals.But " we definitely undergo physiological changes in response to smelling... Question: Which of the following best describes the passage as a whole? - Female flies are insensitive to CO2. - Smells could affect humans' lifespan. - The sense of smell is vital to humans' health. - Female fmit flies can live longer than male flies.

Ans:Smells could affect humans' lifespan.
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Ques:Read the following article and select the best answer. Article: Booker T. Washington was born in a black slave family in Virginia of the USA in 1856, seven years before slavery was abolished by Abraham Lincoln in January, 1863. He wrote a book about his life called Up From Slavery, which was published in 1901. In the book, he said that he had no choice but to work in a coal mine when he was 16 years old. He had no chance to go to school. He heard two coal miners talking about a school for black children which was called the Hampton Institute. He determined that he would go there. He gave up his job and told other members of his race that he was going to school across the state. The older people had spent their best years as slaves and were poor. However, some gave Booker some pocket money or a handkerchief. Hardly had anyone expected any of their race to leave home to attend a boarding school. He took a train to Richmond, Virginia, where he ran out of money. It was 82 miles from the Hampton Institute. He slept under a wooden sidewalk . He helped unload pigs and iron from a ship for some money and when he had enough, he continued his journey, arriving at school with 50 cents. This diligence pushed him to graduate and become a teacher at the Hampton Institute. When he was 25 years old, he was asked to start a new school for black children in Alabama. called the Tuskegee Normal and Industrial Institute. Thirty-four years later, this school had 1,500 students and 200 teachers and Booker T. Washington became the most influential black leader of his generation. Question: The older people didn't give Booker much money because _ . - they had no jobs to do - they didn't have much money - they didn't believe Booker would succeed - they didn't wish Booker to go to school

Ans:they didn't have much money
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Ques:Read the following article and select the best answer. Article: Most people are afraid of bees. Anyone who's been stung by one quickly learns to avoid bees whenever possible. I learned that lesson when, as a child, I ran into a beehive. Dozens of bees attacked, stinging me all over my body. It was a painful incident, but I was lucky. Those bees weren't Africanized, or "killer" bees. Killer bees are extremely aggressive . When they become upset, they attack. And just about anything like noises, shiny objects, dark clothes can all cause killer bees to attack. When one killer bee stings a victim, it gives off a chemical. Other bees smell this and go into attack mode. The whole hive will aggressively attack the unfortunate victim. Killer bees will also run their victims for up to a quarter of a mile. Some victims have tried to keep away from the bees by jumping into water. But killer bees will wait for them to come up and then continue their attack. Killer bees can be found in South America and the southern prefix = st1 /United States. They were created when, in 1956, scientists brought African bees toBrazil. African bees were known to increase coffee production. Some scientists thought that these bees might increase honey production, too. So inBrazil, they tried crossbreeding the African bees with European honeybees. The results were _ The new Africanized bees actually decreased honey production and were very aggressive. Scientists tried to separate the bees, but some of them escaped and began rapidly spreading north. Since then, killer bees have been causing damage to humans, animals and the American honey industry. Over the years, these aggressive killer bees have caused nearly 10,000 people to die. What's the best thing to do if you are attacked by killer bees? Fortunately, killer bees don't fly very fast. Most healthy adults can outrun them. Experts advise you to cover your face and run! Question: Which of the following statements is true according to the passage? - It's a better way to jump into water to escape the attack of killer bees. - The Africanized bees did actually increase honey production though aggressive. - Killer bees didn't attack humans, but animals. - It is usually not easy for a killer bee to catch up with a healthy adult.

Ans:
It is usually not easy for a killer bee to catch up with a healthy adult.
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