单项选择题

A．Go to the lab for a quick look.
B．Check on what’s for dinner.
C．Have a run before they eat.
D．Go and see if they have dropped anything in the lab.
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单项选择题
A．It is not easy to see the shortage of experts in the villages.B．Many doctors and engineers are sent to the villages to make up for the shortage of experts.C．Expert medical 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 the villages.
B．Many doctors and engineers are sent to the villages to make up for the shortage of experts.
C．Expert medical systems are widely used in developing countries.
D．Expert systems are owned by wealthy farmers and businessmen.
单项选择题
A．By selling services that make life comfortable.B．By selling land containing oil.C．By selling public lands.D．By selling coal and other natural products.
A．By selling services that make life comfortable.
B．By selling land containing oil.
C．By selling public lands.
D．By selling coal and other natural products.
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