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【单选题】
按照健康膳食结构,农产品需求金字塔第一层是富含碳水化合物的谷物类食品,食用的一般最多;第二层是蔬菜、水果等富含维生素的食品,一般食用较多;第三层是肉蛋奶、豆类等富含蛋白质的食品,一般食用较少;第四层是油脂类食品,一般食用最少。随着素食主义观念的兴起,需求金字塔第三层和第四层的比重应该会怎样变化?A.
降低
B.
升高
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】The generous man devoted all he had _______ the victims, because of which he was highly praised.
A.
to help
B.
helping
C.
helped
D.
to helping
【单选题】Before going abroad he devoted all he could _______ his oral English.
A.
improve。m
B.
to improve
C.
improving
D.
to improving
【单选题】Before going abroad he devoted all he could _______ his oral English.
A.
improve
B.
to improve
C.
improving
D.
to improving
【单选题】The lawyer was so kind that he devoted all his spare time he had _____ the disabled. [ ]
A.
to helping
B.
helped
C.
helping
D.
to help
【简答题】请简术物联网的整体技术框架?
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