单项选择题

A．press
B．pressure
C．power
D．force
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单项选择题
Professional linguists think that the idea of hierarchy works when languages are in issue.
A． Right
B． Wrong
C． Not mentioned
单项选择题
According to the passage, how did knowledge about chemical processes increase be fore 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.
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