[单项选择]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 impor
A. Lipoproteins.
B. Cholesterol.
C. Both.
D. Neither.

[单项选择]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 impor
A. Why people should not drink alcohol.
B. The relationship between drinking alcohol and the possibility of cancer.
C. Benefits and dangers of drinking alcohol.
D. Reasons for drinking alcohol.

[单项选择]When a risk-free asset is combined with a portfolio of risky assets, will the Standard deviation of the resulting portfolio Graph of the possible portfolio return and risk combinations be a linear funtion of the standard deviation display increasing incremental return per unit of the risky asset portfolio of incremental resk change （） ①A. YES NO ②B. YES YES ③C. NO YES
A. ①
B. ②
C. ③

[单项选择]When a risk-free asset is unavailable, the optimal portfolio on an efficient frontier for each investor is represented by the:（）
A. market portfolio.
B. utility curve that intersects the efficient frontier.
C. highest utility curve that is tangent to the efficient frontier.

[填空题]Lowering the Risk of Heart Disease
Like millions of other Americans, I come from a family with a history of heart disease. My father had his first three heart attacks when he was only thirty-one. (46) I grew up with heart disease. It was there, but I didn’t take it seriously.
When I was thirty-one, my blood cholesterol (胆固醇) level was measured for the first time. It was 311 mg/dl, the doctor told me — an extremely high level that put me at a very high risk of heart disease, especially with my family history. He sent me to the National Institutes of Health (NIH) to be screened for participation in a clinical trial. (47) At NIH, physicians explained the degree of risk associated with my blood cholesterol level and the nature of the experiment. This test involves putting a tube through a leg artery (动脉) up to the heart. (48) Learning about the risks of the experiment as well as the risk associated with my raised blood cholesterol level