题目内容
The traditional economic and consumer behaviour models assume a rational, thoughtful consumer who gathers information about a good and then carefully makes a purchase. This () has recently been challenged, particularly because of the growing number of consumer choices.
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Normal average human skin temperature is 37°C. At any lower environmental temperature, heat will be lost from the skin to the environment as the body attempts to heat up the air in direct contact with the body. This () is known as conduction.
Until adjustment of the body clock has occurred, individuals suffering from “jet lag” feel tired during the new daytime, yet are unable to sleep properly during the new night. For athletes in particular this () of sleep can affect mood and powers of concentration and might result in poorer training performances and competition results (Reilly et al. 1997b).
Until recently, the support needs of frail older people in Sweden have been met primarily by the state, with there being little expectation that the family would provide care. This () is now changing as increasing emphasis is being placed on the role of the family.
若以下选项中的变量已正确定义，则正确的赋值语句是：
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