单项选择题

A．It’s small and not comfortable to sit in.
B．It can’t go long distance without recharging.
C．The batteries are expensive to build.
D．It costs a lot to have batteries recharged.
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单项选择题
A．She washed nurses’ aprons and surgeons’ caps.B．She pressed surgeons’ caps and nurses’ aprons.C．She folded surgeons’ caps and nurses’ aprons into knife-edged creases.D．She steamed the clothes of the surgeons and nurses.
A．She washed nurses’ aprons and surgeons’ caps.
B．She pressed surgeons’ caps and nurses’ aprons.
C．She folded surgeons’ caps and nurses’ aprons into knife-edged creases.
D．She steamed the clothes of the surgeons and nurses.
单项选择题
A．By raising pitch.B．By pausing.C．By lowering registers.D．By using gestures.
A．By raising pitch.
B．By pausing.
C．By lowering registers.
D．By using gestures.
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