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    4. drink; drinking 5. supposed

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    3. normal 4. usual; ordinary

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    3. added to

    B. 1. usual 2. common

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    9. Department 10. astonished

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    7. equipment 8. reaction

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    5. weighs 6. electricity

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    3. substance 4. conclusion

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    10. Through a number of experiments, Marie Curie found a new chemical

    　　　　　 Radium(镭), which is later widely used for cancer treatment.

    A. substance B. matter

    C. object D. thing

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