单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

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