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Read the following article and select the best answer. Article: "Keep out or I'll chase you out! This is my property!" You hear this every spring. It is a long musical sound --- a bird song! Birds use their songs to communicate different messages to one another. People who study bird sounds are learning their meanings. Usually it is the male that sings. Early in spring he sings to say that he has picked out a piece of property. He sings to attract a female of his same kind. Together they will raise a family in his territory . He sings to tell all other birds of his kind to keep out. Each kind of bird has its own type of song. Cardinals sing something that sounds a little like "What cheer, cheer, cheer." Towhees sing, "Drink your tea." Most of the time, birds pay attention only to the songs of birds of their own kind. Cardinals answer cardinals, and song sparrows answer song sparrows. A cardinal knows that a song sparrow will not try to steal its mate. So you can see one reason why a cardinal may chase away another cardinal but will not bother a song sparrow. Most different kinds of birds eat different things. To find enough to eat, a bird needs a big piece of land to search in. Many kinds of birds have some ways of dividing up the land into territories. Song sparrows, cardinals ovenbirds, and white-throated sparrows are some of the birds that have territorial systems. Especially in early spring, birds work out the boundaries between their territories by singing "keep out" threats and by chasing and fighting each other. The birds continue singing to tell females that they have set up territories. Neighboring birds seem to agree that there are make believe fences between their pieces of property. Then they do not have to waste energy chasing each other instead of taking care of their young. Scientists guessed that some birds could recognize their neighbors by small differences in their songs. Two scientists who studied white-throated sparrows found that these birds can even tell the difference between songs of individual birds of their own kind. White-throated sparrows... Question: A cardinal may not keep a song sparrow out of its territory because _ . - they sing different songs - they have separate territories - it feels no threat from a song sparrow - song sparrows are friendly to other birds
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it feels no threat from a song sparrow

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Read the following article and select the best answer. Article: Much older than the Great Wall, Stonehenge is one of the world's most fascinating, but least understood historical sites. Every year, thousands of tourists come to admire Stonehenge's beauty and to wonder about how and why it was built. Scientists have dated the site, which is located in prefix = st1 /England, to around 3000 BC. The stone circle was constructed in a number of stages over hundreds of years. It took millions of man hours to raise the heavy stones. Though there are many theories, it is still a mystery how stone-age man dragged such heavy stones over 380 kilometers from where they were made. Prehistoric people had only basic wooden tools. To move the stones they probably used tree trunks to roll them along. Some historians believe that Stonehenge was a temple, the site of ancient sacrifices . Others believe it was a burial place or perhaps even a giant sundial to tell the time. Whatever their ancient use was, the stones have always been a source of fascination for British people. One record from 1135 said the great stones were carried to Englandby giant magical creatures! In modern times Stonehenge has become a huge hit with tourists. Question: According to the passage, it is possible that prehistoric people _ . - spent many hours building the stone circle - moved the stones with simple wooden tools - built the stone circle for no purpose - dragged stones with the help of machines
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moved the stones with simple wooden tools

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Read the following article and select the best answer. Article: The Internet has become part of teenagers' life. There's a report on 3 375 students aged from 10 to 18 in seven Chinese cities. It says that 38 percent of them believe they use the Internet often. While most of them get useful information and use the Internet to help in their studies, some are not using _ in a good way. Many are playing online games too much. A few even visit Web sites they should not look at. Bad things can happen if young people spend too much time on the Internet. In order to help young people use the Internet in a good way, a textbook on good Internet behavior has started to be used in some Shanghai middle schools this term. It uses real examples to teach students all about good ways of using the Internet. It gives useful advice such as it's good to read news or find helpful information to study. Some students also make online friends. But if you are meeting a friend offline, let your parents know. Teachers and parents all think the book is a very good idea. It will teach students how to be a good person in the online world. It will be a guide for teens to use the Internet and keep students away from bad sites. Question: What do most of the students do on the Internet? - To make online friends. - To play online games. - To get useful information to help in their studies. - To visit Web sites they should not look at.
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To get useful information to help in their studies.