单项选择题

Questions 19 to 22 are based on the conversation you have just heard.

A．He was watching the documentary on TV.
B．He was attending a party.
C．He was watching a movie.
D．He was attending a meeting.
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单项选择题
In what way did immigrants seeking economic freedom contribute to the strength of the U. S. economy
A．They introduced advanced political and economic institutions.
B．They brought with them technical and managerial skills.
C．They helped give America social mobility.
D．All of these.
单项选择题
Of the three major factors for the mass migrations to America, which is the most complex factor
A．Economic factor
B．Religious factor
C．Political factor
D．Not mentioned in the text.
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