单项选择题

A．Environmental protection.
B．Pest control.
C．House construction.
D．Fire prevention.
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单项选择题
A．Most are insomniacs.B．Most are teenagers.C．Most are easily cured.D．Most suffer from hypersomnia.
A．Most are insomniacs.
B．Most are teenagers.
C．Most are easily cured.
D．Most suffer from hypersomnia.
单项选择题
A．The lack of qualified personnel.B．A decline in the number of customers.C．Difficulty in finding suitable sites.D．Increases transportation costs.
A．The lack of qualified personnel.
B．A decline in the number of customers.
C．Difficulty in finding suitable sites.
D．Increases transportation costs.
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