单项选择题

Passage One
Questions 26 to 29 are based on the passage you have just heard.

A．Because her home was far away from school.
B．Because her parents asked her to do so.
C．Because she was bored living outside.
D．Because the place where she lived caught fire.
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单项选择题
According to the passage, how did knowledge about chemical processes increase before the seventeenth century
A．Philosophers devised theories about chemical properties.
B．A special symbolic language was developed.
C．Experience led workers to revise their techniques.
D．Experts shared their discoveries with the public.
填空题
Gravity.
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