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(三) 某企业(业主)一套加氢装置扩建安装工程由某施工单位承担。工程包括：动设备安装23台，静设备安装15台，非标设备现场制作240t，管道安装23000m。合同工期6个月。其中动、静设备安装，非标设备制作统称为设备安装工程，其直接工程费约300万元。合同规定：设备安装费按照《建筑安装工程费用项目组成》(建标[2003]206号)中的综合单价法计价和结算。设备安装各项费用的取值如下：措施费为直接工程费的5%：间接费为直接费的10%；利润为直接费和间接费的8%，税率为3.4%。合同其他条款如下： (1)管道安装费按0.016万元/米计算，管道安装实际工程量超过估算工程量10%时进行调整，调价系数0.9。 (2)开工前业主向施工单位支付估算合同总价20%的工程预付款：工程预付款在最后两个月扣除，每月扣50%。 (3)业主每月从施工单位的工程款中按3%的比例扣留工程质量保修金。施工单位前3个月进行设备安装，从第3个月开始进行管道安装。其中管道安装工程每月实际完成并经监理工程师签证确认的工程量如下表。每月实际完成的工程量时间第3月第4月第5月第6月管道安装工程量(m) 5000 8000 9000 6000 工程保修期间，一台现场制作的设备被损坏，业主多次催促施工单位修理，施工单位一再拖延，最后业主请其他施工单位修理，修理费1.5万元。计算全部安装工程预付款总额。

(一) 某机电安装工程合同在履行过程中，业主要求施工承包单位加速施工，施工承包单位在监理工程师发出加速施工指令后的第30天向监理工程师发出索赔意向通知。随后，施工承包单位又向监理工程师提示了补偿经济损失的索赔报告及有关资料。索赔报告中详细准确地计算了损失金额及时间，并证明了客观事实与损失之间的因果关系。合同实施过程中引起索赔的原因有哪些

Passage ThreeQuestions 32 to 35 are based on the passage you have just heard,

A. High school teachers.
B. Taxi drivers.
C. Waiters.
D. Fruit sellers,

When risk of death from heart attack is plotted on a graph against alcohol consumption, studies consistently show a U-shaped curve, which suggests that non-drinkers and heavy drinkers have higher rates of heart disease than light to moderate drinkers. The implication is that moderate drinking offers protection from heart disease. For years, doctors believed that the death rate among people who do not drink at all was artificially high because it included a substantial number of reformed drinkers, irreparably damaged by alcohol. However, more recent studies which separate life-long drinkers from abstainers have shown that abstainers are still at high risk. Studies have shown that moderate drinkers have higher levels of high-density lipoproteins (脂蛋白) in their blood. This is the "good" cholesterol that protects against heart disease. Alcohol also appears to reduce the risk of heart diseases. Though drinking alcohol in moderation undoubtedly brings some benefits, it is important not to play down the dangers of heavy drinking. Alcohol is related to a string of health problems including cirrhosis (硬化) of the liver, cancer of the mouth, high blood pressure and hemorrhage stroke. Some people believe that wine, in particular, has additional beneficial properties that set it apart from other alcoholic drinks. The French have significantly less heart disease than does any other industrialized nation except Japan. For example, in Toulouse, France, the annual heart disease death rate per 100,000 men is 78--barely a fifth of the number in Glasgow, Scotland. French doctors believe that the low rate of heart disease is a result of the fact that the French consume large quantities of wine. The relationship between alcohol consumption and the risk of developing cancer has also been studied. Population studies suggest that people who drink moderately are at less risk than those who do not drink at all. Again, wine may be largely responsible for the benefits. Other research suggests that drinking moderate amounts of alcohol also reduces the risk of catching everyday infections like colds. A recent study showed that drinking two units of alcohol dally can halve susceptibility to infections. Which of the following is the substance mentioned that helps to protect against heart disease

A. Lipoproteins.
B. Cholesterol.
C. Both.
D. Neither.