单项选择题

A．Because it was their hometown.
B．Because they wanted to help the AIDS patients.
C．Because they were doing their summer social topics.
D．They were learning medicine and doing research on HIV.
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单项选择题
A．Because some book in the library are very expensive.B．Because some books in the library are rare.C．Because sometimes students need certain materials urgently.D．Because some students won’’t return the books they borrow.
A．Because some book in the library are very expensive.
B．Because some books in the library are rare.
C．Because sometimes students need certain materials urgently.
D．Because some students won’’t return the books they borrow.
单项选择题
A．There are many visitors there.B．There are many students there.C．There are many old streets there.D．There are many bicycles there.
A．There are many visitors there.
B．There are many students there.
C．There are many old streets there.
D．There are many bicycles there.
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