55. What message does the author try to convey at the end

　　54 How can scientists help cope with poverty and hunger?　　A) By collaborating closely with world economic i

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　　53 What will happen when food aid is offered at a price?　　A) The rich will become richer and the poor p

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　　52 What do we learn about the WFP& 39;s effort to eliminate hunger?　　A) It has ensured a sufficient food

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　　51 What does the WFP& 39;s winning of the Nobel Peace Prize make us realize?　　A) More and more people in

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　　50 What does the author imply by saying aquaculture is no silver bullet?　　A) Shrimp-farming is a risky bus

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