单项选择题

Britain's longest rivers are ______.

A．the Severn and the Clyde.
B．the Thames and the Clyde.
C．the Clyde and the Humber.
D．the Severn and the Thames.

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单项选择题

All of the following are mentioned as factors threatening seafood EXCEPT ______.

A．change of climate.
B．fish farms.
C．pollutants.
D．rapid development.

单项选择题

It can be inferred from the first paragraph that ______.

A．fishermen are afraid of pirates and storms most.
B．people should take measures to secure fish supply.
C．about 50 years later, we won't be able to eat fish.
D．Worm expects global catch data to continue surging.

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