单项选择题

A．Because it is interesting and creative.
B．Because it has a big effect on our lives.
C．Because she can make big money with it.
D．Because she can graduate more easily.
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单项选择题
A．To help the man pack.B．To look after her sister’s child.C．To stay at home.D．To visit her sister.
A．To help the man pack.
B．To look after her sister’s child.
C．To stay at home.
D．To visit her sister.
单项选择题
Which of the following is consistent with the passage
A．Current rockets are vulnerable and unstable.
B．New propulsion system has been developed.
C．People consider laser beams as a possible solution to developing new propulsion system.
D．At present, nuclear energies can be used in propulsion systems.
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