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．He will be singing traditional English songs.B．He will be talking to his professor.C．He will be on his way to an English club.D．He will be practising his listening skills.
A．He will be singing traditional English songs.
B．He will be talking to his professor.
C．He will be on his way to an English club.
D．He will be practising his listening skills.
单项选择题
A．Because be can improve his language ability.B．Because he can have a good time singing.C．Because the woman says it is exciting.D．Because he has to meet his professor there.
A．Because be can improve his language ability.
B．Because he can have a good time singing.
C．Because the woman says it is exciting.
D．Because he has to meet his professor there.
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