单项选择题

Other countries are also expected to begin clinical gene therapy trials soon.

A． Right
B． Wrong
C． Not mentioned
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单项选择题
The HIV virus is an excellent warrior to fight the body's immune cells.
A． Right
B． Wrong
C． Not mentioned
单项选择题
The HIV virus has caused more deaths in developed countries.
A． Right
B． Wrong
C． Not mentioned
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