【C18】A．rightfulB．carefulC．usefulD．helpful

【C18】A．thatB．whichC．whatD．／

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A．useB．usedC．usefulD．usefulness

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Packaging is designed so as to encourage impetuous shopping.A．extravagantB．carefulC．impote

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【C20】A．consciousB．carefulC．worriedD．wary

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A．complexB．carefulC．diligentD．elastic

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【C7】A．carelessB．carefulC．carefreeD．cautious

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下列物质中 ( )是目前已经肯定的必需脂肪酸。A C16:2B C18:2C C18:3D C20:3(E)C20:4

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