单项选择题

A．Fire prevent.
B．Pest control.
C．House construction.
D．Toxic chemicals.
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单项选择题
A．Collecting objects on the beach.B．Creating models of different shapes.C．Mapping currents in the ocean.D．Tracking water pollution.
A．Collecting objects on the beach.
B．Creating models of different shapes.
C．Mapping currents in the ocean.
D．Tracking water pollution.
单项选择题
A．To commemorate a historic flight,B．To try out eight new balloons.C．To recruit balloonists from all over the United States.D．To test whether helium (氦气) balloons are better than hot-air balloons.
A．To commemorate a historic flight,
B．To try out eight new balloons.
C．To recruit balloonists from all over the United States.
D．To test whether helium (氦气) balloons are better than hot-air balloons.
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