Once a baby cries, the parents will go to see what happened as soon as possible. According to a new study, a baby's cry can make adults react  very quickly, even if they are not related. Oxford University researchers used the classic game whack-a-mole for the study.  Whack-a-mole  requires people to hit one of nine buttons  . The players must react as quickly as they can to whichever of the buttons lights up at random . It is a game that requires speed and accuracy ( ). The study included 40 men and women volunteers aged 19 to 59. Some of them had sons or daughters but none had a baby at the time. They played whack-a-mole after listening to different sounds, including babies crying, the crying of adults in trouble and birdsong played at a similar pitch to the babies' cries. The volunteers' scores were higher after listening to the sound of crying babies. Men and women had similar scores overall. The results showed that a crying baby gets special attention. "Few sounds make people react quite like the cry of a baby," said Morten Kringelbach of Oxford's psychiatry  department, who led the study. "For example, it's almost impossible to ignore(,) crying babies on planes. This is true even though there are so many other noises around." He added that a baby's cry can increase adults' heart rate and blood pressure. This is understandable, because in the course of human evolution  , taking care of babies has always been an important job for adults. When a baby is hungry or feeling bored or unwell, it will cry. As a result, human brains and bodies develop a special reaction to a baby's cry. According to the passage, a baby's cry   _  . A) has the same pitch as birdsong B) is the noisiest sound there is C) can increase adults' heart rate and blood pressure D) is good for its health
C
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An American writer, Mr Green once  said, "Everybody talks about the weather, but nobody does anything about it." It is true that everybody talks about the weather. Many people begin their talks by saying, "Isn't it a nice day?" "Do you think it will rain?" "I think it's going to snow." Many people think they can tell what the weather is going to be like. But sometimes they don't agree with each other. One man may say, "Do you see how cloudy it is in the east? It's going to rain tomorrow." Another man will say, "No, it's going to be fine tomorrow." People often look for the weather they want. When a farmer needs water, he looks for something to tell him it's going to rain, and he doesn't look for anything else. When friends have a picnic, they hope the weather is going to be fine and they can sit eating their lunch under the blue sky. Almost everyone listens to what the weatherman says. But he doesn't always tell us what we want, and sometimes he makes a mistake. Still, he is right most of the time. People often begin their talk by   _  . A) saying hello to each other B) Drinking tea C) Looking for good weather D) saying something about the weather
D
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All our food comes from the soil . Some of us eat meat, but animals live on plants. If there are no plants, we will have no animals and meat. So the soil is necessary for us to live. The top of ground is usually covered with grass or other plants. Plants grow in soil, which has a dark color. This dark soil is humus. Dead leaves, dead plants and animals' waste make it, but this takes a long time. When the humus has been made, plants can grow well in it. All soil needs food. If we don't give it any, the plants will be weak. Animals' waste is the best food for the soil, but chemical fertilizers   are also very useful. The same crop   should not be grown in the same place every year; it is better to have a different crop. A change of crop and the use of a good fertilizer will keep the land in good condition. When the soil is dry, the wind blows it away. Sometimes heavy rain carries the humus down to a river. People should grow more and more trees and grass to stop wind from carrying the humus  away. It takes hundreds of years to make humus, and so we must save every bit of it. Without soil, where can we grow food? We should save every bit of humus, because   _  . A) it takes a long time to make humus B) sometimes the wind will blow the dry soil away C) the chemical fertilizers are expensive D) animals waste is the best food for the soil
A
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In the 13th century , the famous Italian traveller, Marco Polo, travelled a long way to China.During his stay in China, he saw many wonderful things. One of the things he discovered was that the Chinese used paper money. In western countries, people did not use paper money until the 15th century. However, people in China began to use paper money in the 7th century . A Chinese man called Cai Lun invented  paper almost 2,000 years ago. He made it from wood. He took the wood from trees and made it into paper. He then put these pieces of paper together and made them into a book. Now paper still comes from trees. We use a lot of paper every day. If we keep on wasting so much paper, there will not be any trees left on the earth. If there are no trees, there will be no paper. Every day, people throw away about 2,800 tons  of paper in our city. It takes 17 trees to make one ton of paper.This means that we are cutting nearly 48,000 trees every day. Since it takes more than 10 years for a tree to grow, we must start using less paper now. If we don't, we will not have enough time to grow more trees to take the place of those we use for paper. So how can we save paper? We can use both sides of every piece of paper, especially when we are making notes. We can choose drinks in bottles instead of those in paper packets. We can also use cotton handkerchiefs   and not paper ones. When we go shopping, we can use fewer paper bags. If the shop assistant gives us a paper bag, we can save it and reuse it later. Everyone can help to save paper. If we all think carefully, we can help protect  trees. But we should do it now , before it is too late. People in western countries first used paper money in the  _   century. A) 17th B) 15th C) 13th D) 7th

B
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