A．change feed into muscle more efficiently.
B．stand low oxygen levels in water.
C．tolerate extremely cold water.
D．grow larger and faster.
参考答案C
解析:
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A．It doesn't contain much protein necessary for fish.
B．It is not so easily developed as the plant alternatives.
C．It creates serious phosphorous pollution.
D．It is not. as diverse asthe plant alternatives.
A．optimistic.
B．negative.
C．indifferent.
D．uncertain.
A．the major resource of seafood
B．a pollution-free industry
C．the major source of protein
D．an industry of sustainable development