Read the following article and select the best answer. Article: In Yemen, you always see one type of vehicle on the road: the water truck.They travel mountain roads and cross deserts to bring Yemenis the goods more valuable than oil.It is one that only the rich can afford, with the supply regularly being cut off.Others must rely on scarce rain or charity to fight thirst. Experts say Yemen is going to be the first country in the world to run out of water.The capital, Sanaa, will run out of drinking water as early as 2025,says a report by the World Bank. Hannan, an 18yearold from Lahej, said that only the rich could prepare for cuts in supply."In a good week we'll have a water supply all week but then the following week there will be water only for a day or two, " she said. She and her husband, a factory worker, pay 3,000 riyals (99yuan) for a week's supply of water from a touring water truck when the taps run dry.With an income of only 20,000 riyals (660yuan) a month,this means the family often spend half their money on water. "There are a lot of people who can't afford it and they have to rely on their neighbors to help," she said. The average person in Yemen survives on onefifth of what the World Health Organization considers to be enough water. In Taiz, in the south,tap water is available only once every 45 days.In the mountainous Malhan district in the north,women and children climb a 1,500m mountain to collect water from a spring, often in the small hours to avoid long queues. Yemen is located in Southwest Asia,bordering the Arabian and Red Sea.Yemeni people have lived on scarce water supplies for thousands of years but that problem has been made serious by conflict in the area,the fastgrowing population and the use of water to grow a drug called qat.With one of the world's highest rates of population growth--3.46 percent, Yemen is the poorest Arab country. The government is considering desalinating seawater,but this would be expensive and it may now be too late.The only other solution is to cut down on farming, but that means importing even more food. Question: The passage aims to _ . - analyze the reasons why Yemen lacks water - suggest some solutions to the water issue in Yemen - present how serious the water problem is in Yemen - encourage the world to help Yemenis who are suffering from water shortages
suggest some solutions to the water issue in Yemen

Read the following article and select the best answer. Article: Each Indian tribe had a different language. Many Indians never learned any languages except their own. Do you know how Indians from different tribes talked to each other? They had two ways to talk without sound. One way was by sign language; another way by signals. Sign language is a way of talking by using signs. Indians used sign language when they met strangers. In this way, they could find out whether the stranger was a friend or an enemy. In Indian sign language, signs were made with the hands. One sign meant "man". Another meant "horse". To tell the time of day when something happened, an Indian pointed to the sky. He showed where the sun had been at the time. Indians usually used signals when they wanted to send messages to someone far away. To make signals, an Indian might use a pony. He might use a blanket. Or he might use smoke, a mirror or fire arrows. To signal that he had seen many animals, an Indian rode his pony in a large circle. Sometimes the Indian gave a signal like this and then went away to hide. This meant that there was danger. The blanket signal was visible from far away. An Indian held the corners of a blanket in his hands. Then he began to swing the blanket from side to side in front of him. An Indian could send many different signals with his blanket. He could also send many signals with a mirror. He usually used the mirror to warn someone of danger. Of course, mirrors could be used only when the sun was shining. At night, Indians used fire arrows for signaling. Now you can see that Indians didn't need to learn each other's language. They could talk to one another by using signals or sign language. Question: The story tells about _ . - people living in Indian - how Indians communicate between different tribes - the Indians who didn't use their languages - the Indians who had many kinds of languages
how Indians communicate between different tribes

Read the following article and select the best answer. Article: On an elementary school playground, hundreds of children run and jump, smiling and laughing as they play. Watching sea otters playing in their own environment is like watching children at play. Sea otters, which are presently on the endangered species list, are experiencing an increase in population. Groups of sea otters live on the shores of the North Pacific Ocean. They are seldom found far from land but almost spend their entire lives at sea. The otter has been known to dive as deep as 180 feet and stay underwater as long as minutes. Each day the sea otter eats as much as one-fifth of its body weight in fish or shellfish. Not only are sea otters playful, they are also amazingly resourceful. Their favorite food, abalone , is protected by a thick shell that sea otters are unable to break with their teeth. Sea otters use stones from the ocean floor and break the abalone open on their bellies as they move slowly across the surface of the water on their backs, a behavior that makes them one of only a few animals on Earth, including human beings, to use tools! Their intelligence is also displayed while sleeping. In order not to move into dangerous waters, sea otters actually cover themselves with plants on the sea, which keep them in place before falling asleep. Because sea otters have a special means of keeping insulated , they can keep their body heat in their cold environment. They have unbelievably fine fur that traps tiny bubbles, and that keeps them comfortable when warmed by body heat. However, their fur loses this insulating quality if it becomes dirty. Sea otters have faced dangers from hunters in the past and from oil spills more recently. Fortunately, due to a 1911 agreement and to rescue and habitat protection efforts, the sea otter population has nearly recovered. Question: The author mentioned playful children at the beginning in order to _ . - show sea otters are fun to watch. - describe a scene where children play with sea otters. - compare children with sea otters. - discuss the problem faced by sea otters
show sea otters are fun to watch.