单项选择题

A．Their competitors have long been advertising on TV.
B．TV commercials are less expensive.
C．Advertising in newspapers alone is not sufficient.
D．TV commercials attract more investments.
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单项选择题
A．At a booking office.B．In a Hong Kong hotel.C．On a busy streetD．At an airport.
A．At a booking office.
B．In a Hong Kong hotel.
C．On a busy street
D．At an airport.
单项选择题
A．It is not easy to see the shortage of experts in villages.B．Many doctors and engineers have been sent to the countryside to solve problems.C．Computer expert systems are widely used in developing countries.D．Expert systems are owned by wealthy farmers and businessmen.
A．It is not easy to see the shortage of experts in villages.
B．Many doctors and engineers have been sent to the countryside to solve problems.
C．Computer expert systems are widely used in developing countries.
D．Expert systems are owned by wealthy farmers and businessmen.
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