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A．They need little experimentation.
B．Their cost is very cheap.
C．They can be used in many countries.
D．Their source is plentiful.
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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.
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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