单项选择题

Questions 8 to 10 are based on the following news. At the end of the news item, you will be given 10 seconds to answer each question. Now listen to the news. There are ______ Russian(s) and ______ American(s) on board.

A．one, one
B．one, two
C．two, two
D．two, one
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单项选择题
Which of the following is not a factor that has contributed to the rapid population growth
A．Now, there are no wins and people live in a peaceful world.
B．More children can live to their adulthood and have their own children.
C．People live longer now than in the past.
D．People immunize many fatal diseases of which many people died.
单项选择题
Which of the following may NOT give biases to the ethnographer’s study of culture
A．The people who answer his questions.
B．His own cultural background.
C．The kind of information he wants to get.
D．The changes made by his presence in the culture in question.
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