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A．Slavery..
B．Law.
C．Polities.
D．Emancipation of slaves.
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单项选择题A．Greeting the woman.B．Trying to get someone on the phone.C．Asking for a favor.D．Requesting service.

A．Greeting the woman.
B．Trying to get someone on the phone.
C．Asking for a favor.
D．Requesting service.

单项选择题The bold word hampered in Line I Para 2 is closest in meaning to ______.

A．recognized
B．determined
C．solved
D．hindered

单项选择题Which of the following statements best explains why the second of these was the more serious impediment (Underlined )

A．Chemical knowledge was limited to a small number of people.
B．The symbolic language used was very imprecise.
C．Very few new discoveries were made by alchemists.
D．The records of the chemical processes were not based in experiments.

单项选择题What is the passage mainly about

A．The scientific revolution in the seventeenth century.
B．Reasons that chemistry developed slowly as a science.
C．The practical aspects of chemistry.
D．Difficulties of organizing chemical knowledge systematically.

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.