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下列选项中，关于铸铁说法错误的是（)。A．铸铁是铁合金的一种，与钢相比，其成分特点是碳、硅含量高，杂下列选项中，关于铸铁说法错误的是()。
SECTION B PASSAGES
Directions: In this section, you will hear several passages. Listen to the passages carefully and then answer the questions that follow.
听力原文： Men are the cleverest and most dangerous animals on earth. Rats come second. Men kill their enemies. They have killed millions of men since ancient times--but rats have killed hundreds of millions of men. Rats carry diseases. Black rats carry fleas, and these fleas give men bubonic plague. Bubonic plague still kills thousands of Asians and Africans today--as it killed millions of Europeans in the past, until brown rats came to Europe and pushed the black rats out. There is no plague in Europe today, but brown rats carry thirty-five other diseases. One of them has killed 200 million people in the last 400 years. Rats are dangerous. They not only carry diseases into men's homes, they also take men's food. They eat 33 million tons of grain every year. That is enough to feed 200 million people--so men die of hunger because rats eat their food. Rats are clever, too. They have good leaders. Men try to poison them, but if their leaders tell them that food is dangerous, they do not eat it, so our cities and villages are full of rats. We can go to the moon, but we cannot kill this dangerous enemy. Why？ Is it because we are not clean？
There are no black rats in Europe today because
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But nowhere has a bigger health problem than America. Soaring medical bills are squeezing wages, swelling the ranks of the uninsured and pushing huge firms and perhaps even the government towards bankruptcy. Ford's announcement this week that it would cut up to 30000 jobs by 2012 was as much a sign of its "legacy" health-care costs as of the ills of the car industry. Pushed by polls that show health care is one of his main domestic problems and by forecasts showing that the retiring baby-boomers (生育高峰期出生的人) will crush the government's finances, George Bush is expected to unveil a reform. plan in next week's state-of-the-union address.
America's health system is unlike any other. The United States spends 16% of its GDP on health, around twice the rich-country average, equivalent to $6280 for every American each year. Yet it is the only rich country that does not guarantee universal health coverage. Thanks to an accident of history, most Americans receive health insurance through their employer, with the government picking up the bill for the poor and the elderly.
This curious hybrid (混合物) certainly has its strengths. Americans have more choice than anybody else, and their health-care system is much more innovative. Europeans' bills could be much higher if American medicine were not doing much of their Research and Development (R&D) for them. But there are also huge weaknesses. The one most often cited—especially by foreigners—is the army of uninsured. Some 46 million Americans do not have cover. In many cases that is out of choice and, if they fall seriously ill, hospitals have to treat them. But it is still deeply unequal. And there are also shocking inefficiencies: by some measures, 30% of American health spending is wasted.
Then there is the question of state support. Many Americans disapprove of the "socialized medicine" of Canada and Europe. In fact, even if much of the administration is done privately, around 60% of America's health-care bill ends up being met by the government. Proportionately, the American state already spends as much on health as the OECD (Organization of Economic Cooperation and Development) average, and that share is set to grow as the baby-boomers run up their Medicare bills and ever more employers avoid providing health-care coverage. America is, in effect, heading towards a version of socialized medicine by default.
Health problems mentioned in the passage include all the following EXCEPT ______.
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