单项选择题

A．Using computers is a waste of resource.
B．Many people don’’t turn off the computers after using them.
C．Computers are run by electricity.
D．A computer is not a must for working.
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单项选择题
A．At a bank.B．At a restaurant.C．On campus.D．At a post office.
A．At a bank.
B．At a restaurant.
C．On campus.
D．At a post office.
单项选择题
A．To tell the crab what time it is.B．To protect the crab from the sunlight and enemies.C．To keep the crab warm.D．To be of no real use.
A．To tell the crab what time it is.
B．To protect the crab from the sunlight and enemies.
C．To keep the crab warm.
D．To be of no real use.
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