题目

Understand the Economic Concept of a Budget LineThe term “budget line has several related meanings, including a couple that are self-evident and a third that is not.The Budget Line as an Informal Consumer UnderstandingThe budget line is an elementary concept that most consumers understand intuitively without a need for graphs and equations—it's the household budget, for example.Taken informally, the budget line describes the boundary of affordability for a given budget and specific goods.Given a limited amount of money, a consumer can only spend that same amount buying goods. If the consum5、把萌发的种子放入暖水瓶中，几小时后，暖水瓶中温度的变化是    (    )     A．升高    B．降低    C．不变    D．高低不定