单项选择题

What is the cost of a round trip

A．Two dollars.
B．Four dollars.
C．More than that of a one-way trip.
D．Double that of a one-way trip.
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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.
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.
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