题目内容：
根据材料回答题： Fishing adds only about one percent to the global economy, but on a regional basis it can contribute extremely to human survival. Marine fisheries contribute more to the world’s supply of protein than beef, poultry or any other animal source.
Fishing typically does not need land ownership, and because it remains, generally, open to all, itis often the employer of last resort in the developing world an occupation when there are no otherchoices. Worldwide, about 200 million people rely on fishing for their livelihoods. Within Southeast Asia alone, over five million people fish full time. In northern Chile forty percent of the populationlives off the ocean. In Newfoundland most employment came from fishing or servicing that indus-try--until the collapse of the cod fisheries in the early 1990s that left tens of thousands of people outof work.
Though debates over the conservation of natural resources are often cast as a conflict betweenjobs and the environment ,the restoration of fish populations would in fact boost employment. MichaelP. Sissenwine and Andrew A. Rosenberg of the U.S. National Marine Fisheries Service have esti-mated that if depleted species were allowed to rebuild to their long term potential, their sustainable use would add about $8 billion to the U.S. gross domestic product and provide about 300,000 jobs. Iffish poupulations were restored and properly managed, about twenty million metric tons could be added to: the world’s annual catch. But restoration of ecological balance, fiscal profitability (收益) andeconomic security will require a continual reduction in the capacity of the commercial fishing industryso that wild populations can recover.
The necessary reductions in fishing workforce need not come at the expense of jobs. Governments could increase employment and reduce the pressure on fish populations by guiding subsidies away from highly mechanised ships. For each $1,000,000 of investment, industrial scale fishing operations require only one to five people, while small scale fisheries would employ between 60 and 3,000. Industrial fishing itself threatens tens of millions of fishermen working on a small scale by depleting the fish on which they depend for subsistence.
The animal source which provides the most protein for human being is________ A．beef
B．fish
C．pork
D．chicken
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