单项选择题

As far as the study is concerned, what has caused the bigger public health problem

A．the radiation
B．the poor medical conditions
C．the weak support from the authorities
D．local people’s fear and innocence
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单项选择题
Who were the discontented individuals to whom Lincoln referred in his speech
A．Leaders of the Southern rebellion.
B．Slaves in the Southern states.
C．Northern opponents of the war.
D．Southern soldiers.
单项选择题
Why is the second theory sometimes referred to as the Mars Theory
A．Earth’s moon used to orbit Mars.
B．Mars was captured by the gravitational field of the Sun.
C．A planet the size of Mars collided with Earth.
D．Mars is larger than Earth.
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