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.
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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
A．Multiple choice questions are objective because people cannot be trained any techniques.
B．Sweden emphasizes the teaching of English without paying attention to other countries.
C．We have to depend on our own impression to judge the English standards.
D．Compositions are useful to test people's English ability because people have to write out their viewpoints.