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．The high altitude.B．The unpredictable climate.C．The extreme temperatures.D．The wild animals.
A．The high altitude.
B．The unpredictable climate.
C．The extreme temperatures.
D．The wild animals.
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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