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.
填空题
horrifying
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