单项选择题

A．Bacteria can help control some pollution problems.
B．Bacteria can eat gasoline in the sea.
C．Bacteria can excrete (排泄) hydrogen and oxygen.
D．He thought bacteria just caused illness.
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单项选择题
A．About four days.B．Around eight days.C．A day and a half.D．More than six days.
A．About four days.
B．Around eight days.
C．A day and a half.
D．More than six days.
单项选择题
A．A message from the outside world.B．A symbol of misfortune.C．A warning from the gods.D．A gift from the gods.
A．A message from the outside world.
B．A symbol of misfortune.
C．A warning from the gods.
D．A gift from the gods.
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