单项选择题

A．Collecting information about the bacteria.
B．Working on a cattle ranch.
C．Writing a paper about extinct animals.
D．Analyzing buffalo behavior.
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单项选择题
A．Most Londoners were frightened.B．Most Londoners became rather confused.C．Most Londoners took Exercise Flood Call calmly.D．Most Londoners complained about the trouble caused by Exercise Flood Call.
A．Most Londoners were frightened.
B．Most Londoners became rather confused.
C．Most Londoners took Exercise Flood Call calmly.
D．Most Londoners complained about the trouble caused by Exercise Flood Call.
单项选择题
A．Pollution of the environment.B．A new generation of pest killers.C．Over-killing by hunters.D．Destruction of their natural homes.
A．Pollution of the environment.
B．A new generation of pest killers.
C．Over-killing by hunters.
D．Destruction of their natural homes.
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