单项选择题

A．One sixth of them are seriously polluted.
B．One third of them are seriously polluted.
C．Half of them are seriously polluted.
D．Most of them are seriously polluted.
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单项选择题
A．His friend gave him the wrong key.B．He didn’’t know where the back door was.C．He couldn’’t find the key to his mailbox.D．It was too dark to put the key in the lock.
A．His friend gave him the wrong key.
B．He didn’’t know where the back door was.
C．He couldn’’t find the key to his mailbox.
D．It was too dark to put the key in the lock.
单项选择题
A．He is waiting for his favorite program.B．He is not getting on well with his roommate.C．He is relieving his study pressure.D．He is waiting for the woman.
A．He is waiting for his favorite program.
B．He is not getting on well with his roommate.
C．He is relieving his study pressure.
D．He is waiting for the woman.
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