党员对党的决议和政策如有不同意见，下列说法中，正确的应该是（）。
A. 可以不执行党的决议和政策
B. 在坚决执行的前提下，可以声明保留，并且可以把自己的意见向党的上级组织直至中央提出
C. 必须坚决执行，不可以声明保留，也不允许向上级组织提出
With respect to a decrease in the price of a normal good, the income effect:
A. and substitution effect both tend to increase consumption of the good
B. is to decrease consumption of the good, and the substitution effect is to increase consumption of the good
C. is to increase consumption of the good, and the substitution effect is to decrease consumption of the good
A business believes a price discrimination strategy will increase both its output and profits. For this to occur, the firm must have:
A. customers who cannot resell the product and whose price elasticities of demand are in a limited range
B. distinct groups of customers with different price elasticities of demand who are able to resell the product
C. distinct groups of customers with different price elasticities of demand who cannot resell the product
内呼吸是指氧气从吸入()的空气中进入血液，进行血氧交换。
A. 上呼吸道
B. 肺泡
C. 肺管
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