单项选择题

A．Because it’ s too expensive to buy it.
B．Because she doesn’t need it.
C．Because she can’ t buy it everywhere.
D．Because she already has got one.
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单项选择题
A．Monday.B．Tuesday.C．Wednesday.D．Thursday.
A．Monday.
B．Tuesday.
C．Wednesday.
D．Thursday.
单项选择题
Which of the following does this passage mainly discuss
A．The application of bionics.
B．The first "open heart" surgery.
C．The development of the artificial heart.
D．The future of applied bionics.
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