The structure of a family takes different forms around the world and even in the same society. The family's form changes as it adapts to 41 (change) social and economic influences. Until recently ,the most common form in North America was the nuclear family, 42 (consist) of a married couple with their minor children, The nuclear family is an 43 ( depend) unit. It must be prepared to fend for it self. Individual family members 45 (strong) depend on one. another. There is little help from outside the family in emergencies. Elderly 45 ( relative) of a nuclear family are cared for only if. it is possible For the family to do s0. In North America,the 46 ( elder) often do not live with the family;they live in 47 ( retire) communities and nursing homes.
There are many parallels. between the nuclear family in, 48 ( industry) societies, such as North America,and of family in societies such as that of the Inuits, who live in harsh environments. The nuclear family structures well 49 ( adapt) to a life of mobility. In harsh conditions, mobility allows the family to hunt for food. For North Americans,the hunt for jobs and 50 ( improve) social status also requires mobility.
According to the passage, in operating airlines it is essential to.()
A、keep in mind the need. of the executives only
B、satisfy the need of the low fare passengers at the expense of theexecutives
C、try to attract as many passengers as possible by reducing fares
D、cater to the need of passengers setting at both ends of the jets
Which of the following is a bad habit of the executive passengersthat frustrates the airlines?()
A、They do not book their seats in advance.
B、They do not sit on the seats they are supposed to take.
C、They do not travel on the flight they have booked.
D、They do not pay in advance for the seats they book.
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