Read the following article and select the best answer. Article: Space travel is definitely bad for astronauts' bones, reducing their bone density after only a month of weightlessness, according to French research published on Friday. Laurence Vico and his fellow workers at St Etienne University called for more research into the effects of microgravity, after their study of 15 astronauts from the Russian MIR station showed bone loss continued throughout space flights. "Bone loss was especially striking in four astronauts, " the scientists reported in the Lancet Medical Journal. They measured the bone mineral density (BMD) of bones in the forearm and lower leg of the astronauts who had spent one to six months in space. The BMD loss was significant in the tibia of the lower leg, a weight-bearing bone, but barely changed in the radius of the forearm. "Our results indicate the need to investigate not only different bones, but also different areas of the same bone since not all sites of the skeleton are similarly affected by space conditions, " they added. Without gravity the body isn't bearing any weight so there is no need for calcium which makes bones strong, and it becomes empty into the bloodstream. The research team suggested in future scientists should try to determine if the loss of bone density was only on weight-bearing bones on longer flights, also the possible recovery after returning to Earth. Question: Scientists have found that _ . - the BMD loss may cause serious illness to astronauts - the BMD loss may cause some change in astronauts' bodies - astronauts shouldn't care about the BMD loss - astronauts should take some calcium before space travel
the BMD loss may cause some change in astronauts' bodies

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Read the following article and select the best answer. Article: A staycation is a vacation when you do not travel at all. Some people use a staycation to just stay at home, and others prefer to experience the attractions around them without traveling very far. There are many choices for staycations. Any town or city has plenty of choices for things to do if you know where to look. If the weather is nice, you can visit the local gardens or forests for a hike. You can look online for several historic places and create your own history tours. Of course, you can also visit other attractions in the areas like museums, restaurants, bars, parks, beaches, and so on. Often, if you drive just a few hours, you can find a city that you can walk around and see. Then by driving home you can save the cost of a hotel and a plane ride. Others take the term "staycation" word for word and do not leave their houses at all. Some choices for this can include taking time off to cook a great meal and enjoy it together or spending all day at a pool. Just as a coin has two sides, staycation has its advantages as well as disadvantages. Since you are not traveling or staying in a hotel, a staycation can be unbelievably costeffective . You don't have to pay for a hotel, so that cost has been completely _ . You are also saving by not driving very far and by not taking an airplane anywhere. Travel costs have become really high, and the farther you go, the higher they are. By staying close to home, you cut that cost by quite a bit. You are also pushing money back into your local economy by spending your money at local businesses rather than in cities that are far away from home. Finally, any stress that you feel with travel, whether that is from driving long distances or looking for an airport, will completely disappear. Question: What is one of the advantages of a staycation? - The economy in other cities is also improved. - People spend nothing when staying at home. - You can visit local attractions for free. - There is no stress from traveling.
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There is no stress from traveling.

Ques: Read the following article and select the best answer. Article: Mary Cassatt was born in Pennsylvania in 1844. When she was seven, her family moved to Europe. They wanted their children to understand European ways and the people who lived there. They travelled a lot and she had visited many countries by the time she was 10 years old. After four years they returned to America. In those days, women didn't have professions, and there were very few women artists. Her family did not approve when she decided that she would become an artist. She studied first in Philadelphia. She happened to be in Chicago in 1871 when the huge fire broke out there. She lost many of her paintings in that fire. She went to Paris to study painting. She met Camille Pissarro there. He taught her Impressionism, a method of painting where the artists used small strokes of unmixed color1s to create an image. She once said of Pissarro that " _ " because he was such a good teacher. She spent a lot of time at the Louvre Museum copying paintings of the famous artists. In 1874, her sister, Lydia, came to live with her in Paris. Lydia was her best friend and posed for many of Mary's paintings. Three years later, her parents came to Paris, also to live with them. Lydia became very ill and died from a disease. Mary missed her very much. Her parents became elderly and she cared for them, but she still found time to paint. One of the more interesting works of Mary Cassatt is her painting, Portrait of Mrs. Curry, Sketch of Mr. Cassatt. Though she never had children of her own, she loved children and painted portraits of the children of her friends and family. She became known as the painter of mothers and children. She lost her sight due to cataracts in her eyes in 1914 and was not able to paint during the later years of her life. Question: What is the passage mainly about? - A brief introduction to Mary Cassatt. - The main works of Mary Cassatt. - The influence of Impressionism on Mary Cassatt. - Mary Cassatt's love for her family.
Ans: A brief introduction to Mary Cassatt.

Read the following article and select the best answer. Article: The term "smog" was first used in London during the early 1900's to describe the combination of smoke and fog. What we typically call " smog" today is a mixture of pollutants but is primarily made up of ground-level ozone . Ozone can be beneficial or harmful depending on where it stays. The ozone staying high above the Earth protects human health and the environment, but ground-level ozone is responsible for the choking, coughing, and painful eyes associated with smog. The ozone in smog also prevents plants growth and can cause widespread damage to crops and forest. Major smog occurrences often are linked to heavy motor vehicle traffic, high temperatures, sunshine, and calm winds. Weather and geography affect the position and severity of smog. Because temperature regulates the length of time it takes for smog to form, smog can form faster and be more severe on a hot and sunny day. When warm air stays near the ground instead of rising and winds are calm, smog may stay trapped over your city for days. As traffic and other sources add more pollutants to the air, the smog gets worse. Smog is often more severe away from the pollution sources because the chemical reactions that cause smog occur in the atmosphere while the reacting chemicals are being moved by the wind. Smog is a visible example of air pollution. You can look into the distance during the day to see how much smog there is in the air. In addition, most cities measure the concentrations of pollutants in the air and report the results to the public. Environmental Protection Agency sets national standards for pollutants. Areas that fail to meet the standards for at least one air pollutant are called "nonattainment areas. " New measures are being taken by local governments across the country to reduce air pollution in nonattainment areas. These include: banning charcoal barbecues and wood burning in stoves or fireplaces when pollution levels are high; developing programs to encourage carpooling and voluntary "ozone actions" ;... Question: According to the passage, ground-level ozone can _ . - damage the environment - benefit human health - protect crops and forest - limit the spread of smog
damage the environment