I like physics best, because I can do a lot of ______.

A.exhibitions B.experiments C.energy D.environment

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一Oh, you come to school by taxi today.

一I __________take a taxi to school, but my bike is broken today.

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Pandas ______ live in the forests and mountains of Southwest China.

A.finally B.mainly C.quickly D.slowly

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We ______ Thanksgiving since the first pioneers arrived in America.

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Are you shy? If you are, you are not alone. In fact, close to 50 percent of people are shy. Almost 80 percent of people feel shy at some point in their lives. These days, shyness is becoming more and more common. Now, scientists are trying to understand shyness. They have some interesting ideas about why people are shy.

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Family size might cause people to be shy as well. Scientists at Harvard University studied shy children. They found that 66 percent of them had older brothers and sisters. As a result, they became shy. At the same time, children with no brothers and sisters may be shy as well. Growing up alone, they often play by themselves. They are not able to learn the same social skills as children from big families.

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