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.
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单项选择题
A．She prefers the stadium.B．She agrees with the man.C．The light isn’t bright enough.D．The dining hall isn’t large enough.
A．She prefers the stadium.
B．She agrees with the man.
C．The light isn’t bright enough.
D．The dining hall isn’t large enough.
单项选择题
A．Problems with the teachers.B．Problems with family members or friends.C．Problems with class work.D．Problems with a part-time job.
A．Problems with the teachers.
B．Problems with family members or friends.
C．Problems with class work.
D．Problems with a part-time job.
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