A．There has been a lot of controversy over the use of flag.
B．The best athletes can wear uniforms with the design of the flag.
C．There are precise regulations and customs to be followed.
D．Americans can print the flag on their cushions or handkerchiefs.
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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.
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.