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【单选题】
关于佝偻病的表现和治疗，下列哪种说法不正确( )A.
主要见于2岁以下幼童病
B.
日光照射不足是主要因索
C.
牛奶含钙高，应主张牛奶喂养
D.
早期患儿表现兴奋状态
E.
新生儿生后2补充维生素
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Refer to Exhibit 3-13. A movement from Point D to Point F:
A.
increases the level of unemployment.
B.
requires the sacrifice of cupcakes in order to acquire more cakes.
C.
requires the sacrifice of cakes in order to acquire more cupcakes.
D.
is not possible given the available resources and technology.
【单选题】Refer to Exhibit 3-1. In the circular flow model:
A.
households receive income from businesses in exchange for providing inputs and use that income to buy goods and services from businesses
B.
businesses receive revenues from households in exchange for providing goods and services and use those revenues to buy inputs from households.
C.
households receive revenue for selling goods and services to businesses, and use that revenue to buy inputs from businesses.
D.
Both a. and b. are correct.
【单选题】Refer to Exhibit 3-13. The opportunity cost of producing an additional cake:
A.
increases as the economy moves in a southeast direction along the production possibilities curve.
B.
decreases as the economy moves in a southeast direction along the production possibilities curve.
C.
remains constant as the economy moves in a southeast direction along the production possibilities curve.
D.
equals zero.
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