【单选题】Within 80 years, some scientists estimate, the world must produce more than eight times the present world food supply. The productiveness of the sea raises our hopes for an adequate food supply in the...
A.
Though the situation is not urgent, we should press forward with our marine research.
B.
Nations throughout the world must be provided with fish, fresh or frozen, for needed protein.
C.
There are enough fish in the U.S. seas to allow for the annual protein needs of a quarter of the world's 5 billion people.
D.
The oceans are the major source of the world's protein supply.