单项选择题

Which group of people don't migrate because of pull factors

A．Refugees.
B．People with overseas relatives or friends.
C．People looking for a good life.
D．People seeking better job opportunities.
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单项选择题
People's decisions to migrate might be influenced by all the following EXCEPT______.
A．personalities
B．marital status
C．education
D．age
单项选择题
We can infer from the passage that______.
A．there is little difference between specialization and professionalisation
B．amateurs can compete with professionals in some areas of science
C．amateurs have national academic societies but no local ones
D．professionals welcome amateurs into the scientific community
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