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第1题

Faces, like fingerprints, are unique. Did you ever wonder how it is possible for us to recognize people? Even a skilled
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第2题

Most young people enjoy some forms of physical activity. It may be walking, cycling or swimming, or in winter skating or
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第3题

One of the most daring deep-space missions NASA has ever launched is turning out to be one of the least publicized. The
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第4题

Man young British doctors drink too much and use cannabis and other illegal drugs, according to a survey released last w
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