单项选择题

A．Hospital employees.
B．City Hall officials.
C．Packer Hall residents.
D．The engineering students.
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单项选择题
A．He is not to blame.B．He was responsible for the accident.C．He will take all the responsibility.D．He will be more careful next time.
A．He is not to blame.
B．He was responsible for the accident.
C．He will take all the responsibility.
D．He will be more careful next time.
填空题
Scientists use ______ to test whether their genetic modification of a plant is successful.
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