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单项选择题

How many people worldwide have been infected with HIV since the start of the epidemic

A．47 million.
B．4 billion.
C．25 million.
D．44 million.
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单项选择题What was Wilt Chamberlain determined to do before he retired

A．To break the previous records.
B．To buy a luxury house.
C．To win one more championship for his team.
D．To play against the New York team once again.

单项选择题What kind of people don’’t need a ticket

A．A group of 4 children.
B．Children not more than 4 years old.
C．Those who ride every day.
D．Those who are free from work.

单项选择题Why is Wilt Chamberlain considered a famous basketball player

A．Because he led his teams to many championships.
B．Because he set as many as 65 different records.
C．Because he still played the game after he retired.
D．Because he didn’’t stop playing even when he was seriously injured.

单项选择题What happened to Wilt Chamberlain in 1972

A．He lost the final chance to win a championship.
B．He was knocked out during one contest.
C．He broke a bone in the wrist during a match.
D．He was awarded with a $1.5 million house.

单项选择题Which of the following has been proved to transmit HIV

A．Tears.
B．Breast milk.
C．Saliva.
D．Nervous system tissue.