What was the population of London at the beginning of the 19th century according to the conversation？
A. More than a million.
B. More than eight million.
C. Less than eight million.
D. Less than a million.
What is the opening concerned in the conversation？
A. Interviewing an assistant.
B. Applying for the post of assistant.
C. Recruiting an assistant.
D. Training to be an assistant.
What Peter Backman said can be best described as
A. conclusive.
B. suggestive.
C. instructive.
D. subjective.
正确答案是（）
A. various
B. external
C. environmental
D. exterior
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