A．visits to the Nixon Library.
B．the Chinese students' visit to the U.S.
C．a meeting discussing relations between China and the U.S.
D．activities to strengthen the ties between the Chinese and American students.
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A．Nixon died.
B．Nixon visited China.
C．Nixon became U.S. president,
D, Nixon started building the library in his name.
A．The China-U.S. relations.
B．The Nixon Library.
C．President Nixon.
D．The Youth Summit.
A．It should be radical and rapid to take effect.
B．It should be gradual and prudent instead of excessively hasty.
C．Political and economic reform should keep hand in hand.
D．Economic reform is essential for political reform.