单项选择题

She was a puzzle.()

A. girl
B. woman
C. problem
D. mystery

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单项选择题

Techniques to employ the energy of the sun are being developed.()

A. convert
B. store
C. use
D. receive

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During the 1800's and early 1900's, new academic disciplines such as chemistry and physics made great headway.()

A. sacrifice
B. forefront
C. preconceptions
D. progress

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