单项选择题

Questions 19 to 21 are based on the conversation you have just heard.

A．She is complaining to her manager.
B．She is talking on the phone with her friend.
C．She is talking with her friend in person.
D．She is checking phone messages.
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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.
单项选择题
The word “it” in Line 3 Para. 2 refers to which of the following
A．problem
B．material
C．difficulty
D．system
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