单项选择题

By listening to the sounds fishes make, man can learn all the following except （）

A．their sizes
B．the usual pattern of their migrations
C．their environments
D．their habits

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单项选择题

Helen Keller learnt to （）

A．care for children.
B．express herself.
C．travel alone.
D．use her physical strengt

单项选择题

Which of the following is TRUE according to the passage（）

A．This influenza can cause death if not treated immediately.
B．The number of the influenza virus can grow very rapidly.
C．The people who got the disease recovered soon.
D．The London doctors did not take the virus seriously at first.