单项选择题

A．They change color every 50 minutes.
B．They change color more quickly.
C．They change color more slowly.
D．They change color on the same schedule.
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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.
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.
单项选择题
A．It has many big and beautiful parks.B．It possesses many historical sites.C．It is a city of contrasts.D．It is an important industrial center.
A．It has many big and beautiful parks.
B．It possesses many historical sites.
C．It is a city of contrasts.
D．It is an important industrial center.
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