传统点火系中的点火线圈的作用是()

Couples are restricting the size of their families in the UK because of cash worries brought on by the financial crisis and the subsequent decline. Were now up to nearly 3. 7 million families where there is an only child, a rise from about 3. 3 million in 2005. That means nearly half of all parents have only one child. Financial worries arent the only driver. The trend towards later motherhood has been mentioned as a cause, as have soaring costs of raising a child, which have been calculated as ￡ 222, 500 from birth to 21 years of age. This is an increase of nearly 40% in 10 years. The increasing availability of IVF(试管婴儿)is also a factor and an interesting one. Couples who might have remained childless in the past now invest in IVF and get pregnant. And because of the cost they stop after one child. It may not be a bad thing: there are outstanding examples of talented only children. Some argue that being an only child promoted their success. These include actors Natalie Portman and Al Paci-no, golfer Tiger Woods and even Queen Victoria. A study from the Institute for Social and Economic Research at the University of Essex also showed that the fewer brothers and sisters a child has, the happier they are. It seems fighting for parental attention and affection—which sometimes descends into physical fights—is more stressful than any adult had previously thought. And its not compensated(弥补)by having a playmate.The smaller size of UK families is mainly related to______.

A．financial
C.technical
D.health
E.cultural

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利物浦是英格兰西北部的一个著名港口城市，英国第四大城市，16世纪中叶利物浦还只是一个人口只有500人的小镇，1699年，利物浦商人的第一艘船进行非洲航行。18世纪末来往于非洲直接的船只已经达到上百艘，导致船只增多的原因是（）

A.英国资产阶级革命的进行
B.新航路的开辟
C.三角贸易的盛行
D.工业革命的进行

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