更多"The stiff up-front cost has always "的相关试题:
[填空题]The stiff up-front cost has always been the biggest barrier to residential use of solar power. An average set of rooftop panels costs $ 20,000 to $ 3.0,000 and takes 10 to 15 years to produce enough electricity to pay for itself--a deal not unlike asking a new cell-phone owner to pay in (47) for a decade’s worth of minutes. But that equation will change as the cost of solar panels drops and the price of fossil-fuel-generated electricity rises. Now solar companies and banks are helping homeowners (48) the cost over the lifetime of the panels,and sunny California is at the forefront of this (49) . In April, SolarCity, one of the biggest panel installers in the state, began (50) no-money-down leases for home installation. PhotovoItaic (光电的) solar installations were up 45% last year compared with 2006,with about a third of those systems going on (51) roofs.
Sure,solar panels are a huge (52) , and credit markets are tighteni
[填空题]In the United States the cost of living has been steadily rising for the past few decades. Food prices, clothing costs, housing expenses, and tuition fees are (36) getting higher and higher. Partly because of (37) need, and partly because of career choices for personal (38) , mothers have been leaving the (39) role of full-time homemaker. Increasingly they have been going out of home and taking (40) jobs in the society.
Making such a significant role change (41) the life of the entire family, especially the children’s. Some (42) are obvious. For example, dinnertime is at a later hour. Mothers leave home early in the morning, feeling (43) because they will not be at home when their children return from school. They suppress their guilt since they believe that their work will benefit everyone in the long run. (44) .
The emotional impact on the children can be significant. After all, they are a
