“梅隆拉响警笛，胡佛敲起警钟，华尔街发出信号，美国往地狱里冲。”这首流传于20世纪二十年代末、三十年代初的美国民谣描绘的是( )
A．华尔街股市暴涨
B．第二次世界大战爆发
C．经济危机爆发
D．美国经济繁荣
答案：C
题目分析：从材料“胡佛”、“华尔街”已经从时间上“二十年代末、三十年代初”可以看出这是描绘的29年开始的经济大危机。故选C。A项说法相反，是股市大跌；B项错误，二战是在20世纪30年代后期爆发的；D项错误，从材料可以看出，美国经济正在遭受着灾难。
点评：起自于美国的29--33年经济大危机持续时间长，破坏性特别大，范围广，加剧了资本主义各国的矛盾，引起了国际关系的紧张。如此严重的经济危机充分说明了自有资本主义经济政策已经不能适应经济的发展，迫切需要国家的宏观调控。
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| The steep rise in breast cancer over the past fifty years has been blamed on a variety of causes--from late childbearing to pesticides. Now Belgian scientists have evidence that it may be caused by teenagers drinking fizzy soft drinks instead of weak beer. At a meeting in Brussels last week, Jack Janssens of the Limburg University Centre in Diepenbeek described experiments in which teenagers fasted for 12 hours then drank a 330-millilitre bottle of a popular fizzy drink--he won’t divulge the brand--or a bottle of "table beer", a drink containing 1.1 per cent alcohol that was popular in Belgium before soft drinks came on the market. The beer is still served in Belgian hospitals, especially to new mothers. The focus of the study was insulin, the hormone that regulates blood sugar levels. As expected, insulin levels shot up after teenagers drank the sugar-laden soft drinks, but not after the beer, which although it contains complex carbohydrates has few simple sugars. "What was really a new observation," says Janssens, "was that the fatter the teenager was, the more the insulin went up." The insulin levels did not depend on the level of blood sugar or the total weight of an individual, just obesity. Janssens thinks insulin is a key factor in the development of the human breast, because it influences levels of several other hormones, including growth factor, sex steroids and their inhibitory binding proteins. Inappropriate secretion of insulin at a critical phase of development, he says, "might induce lesions in the breast cells leading to breast cancer later in life". He believes his research suggests a vicious circle in which "soft drinks and high caloric foods in pubertal children brings accumulation of body fat and in turn increases the response of insulin". This could lead to loss of sensitivity to insulin, which may have a continuing effect on breast cells. "A history of weight gain in early adult life is associated with an increased breast cancer risk in Western women," says Janssens. Insulin may be the link. In males, a similar effect may lead to testicular or prostate cancer. As for the beer, Janssens couldn’t detect any alcohol in the teenagers’ blood, which shows that they metabolise it efficiently, he says. While insulin may play a role in cancer, he says more epidemiological research is required before blaming soft drinks. Denise Baxter of Brewing Research International in Nuffield, Surrey, also told the meeting that as well as vitamin B, beer contains other anti-cancer nutrients, including antioxidants. The meeting was organised by the Confederation of European Brewers. |
What might lead to breast cancer
A．Inappropriate secretion of insulin.
B．Inhibitory binding proteins.
C．Sex steroids.
D．Sugar-laden soft drinks.