单项选择题

A．Because they have all been shot.
B．Because they are too dangerous.
C．Because they are all hiding under the rivers.
D．Because the weather does not suit them nowadays.
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单项选择题
A．They studied variations in the appearance of the parent stars.B．They were able to see the planets with a telescope.C．They compared the parent stars to the Sun.D．They sent astronauts on a mission into space.
A．They studied variations in the appearance of the parent stars.
B．They were able to see the planets with a telescope.
C．They compared the parent stars to the Sun.
D．They sent astronauts on a mission into space.
单项选择题
A．They get married before they buy their own house.B．More people get divorced and do not remarry soon.C．They attend local colleges so they have to stay home.D．They move back so that they can take care of their parents.
A．They get married before they buy their own house.
B．More people get divorced and do not remarry soon.
C．They attend local colleges so they have to stay home.
D．They move back so that they can take care of their parents.
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