单项选择题

A．The oceans and the gold rush.
B．Tourism and the entertainment industry.
C．The railroads and the discovery of oil.
D．Sea trade and the airplane industry.
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单项选择题
What caused the scientists of Sydney University to conduct the investigation
A．A chance encounter with music-playing cars.
B．A proposal by the European Congress of Psychology.
C．An experience of traveling in music-playing vehicles.
D．The growing number of traffic accidents.
单项选择题
A．It moves the same way as fish do.B．It is propelled by tides and currents.C．It swims with its string in all directions.D．It copies the principle of jet propulsion.
A．It moves the same way as fish do.
B．It is propelled by tides and currents.
C．It swims with its string in all directions.
D．It copies the principle of jet propulsion.
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