【C18】A．settingsB．locationsC．situationsD．circumstances

【C18】A．onB．beforeC．atD．in

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【C18】A．merelyB．alwaysC．mainlyD．almost

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【C18】A．thatB．whichC．whatD．／

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材料题请点击右侧查看材料问题 查看材料A.conditionsB.situ

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______ refers to the type of language which is selected as appropriate to the type of situ

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Please inform. us ____ the supply and demand situ

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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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