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.
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单项选择题
A．Environmental protection.B．Pest control.C．House construction.D．Fire prevention.
A．Environmental protection.
B．Pest control.
C．House construction.
D．Fire prevention.
单项选择题
A．Work on his paper after class.B．Postpone his meeting with Professor Green.C．Go swimming with his friends.D．Go to see Professor Green immediately.
A．Work on his paper after class.
B．Postpone his meeting with Professor Green.
C．Go swimming with his friends.
D．Go to see Professor Green immediately.
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