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.
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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.
单项选择题
A．He might lose his financial aid.B．He doesn’t want to attend summer classes.C．He had already missed too many classes.D．He’s afraid he might not graduate.
A．He might lose his financial aid.
B．He doesn’t want to attend summer classes.
C．He had already missed too many classes.
D．He’s afraid he might not graduate.
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