A．They are important food resources.
B．The great fisheries are to be exhausted.
C．Noted biologists insist on their maintenance.
D．Fishes are fewer than American eagles.
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A．They are endangered on land or in the air.
B．They are important species for conservation.
C．They are symbols of different countries.
D．They are examples of zoo animals.
A．The resources of the sea are unlimited.
B．There are threats to animals and birds.
C．Sea resources have to be protected.
D．We must love fish.
A．A regular study program is essential to learning another language.
B．Eating eggs and toast is important for learning another language.
C．Learning another language is as easy as eating eggs and toast.
D．A language-learning program should be set upon eggs and toast.