题目内容：

    When we talk about positive thinking, we often use terms having to do with our hearts — open heart, pure heart or joyful heart. But new research from Duke University is making a closer connection, finding that a positive attitude may be helpful to people who have angina (心绞痛)，a common heart condition.

Symptoms of this condition include chest pain or pressure because the heart is not receiving sufficient oxygen. Patients who displayed optimistic thought patterns, including having positive expectations about recovery, were 40 percent less likely to be hospitalized or require surgery than those who were not optimistic, according to the study. The researchers collected data from 2,400 patients who had diagnoses of angina.

An interesting additional finding from the patients' questionnaires was that the most optimistic patients were also the least likely to have histories of heart attack, heart failure or heart disease.

The researchers did not declare a causal relationship between positive thinking and better heart disease outcomes, however. There are multiple possible reasons for the results of the study, including the idea that patients who are healthier to begin with are more likely to expect to recover and regain good health.

But the study does represent a new way of looking at the situation. Now, in addition to a body of research that examines the relationship between depression and heart health, there is a new way of inquiry that asks whether positive thinking could be used as a strategy to improve outcomes.

Lead researcher Alexander Fanaroff, a fellow in the department of cardiology (心脏病学) at the Duke University Medical Center, told the Duke Chronicle that his next research question will find ways to improve attitudes among heart patients.

Perhaps his subjects could reflect on the word of the writer Anthony J. D'Angelo: "Smile, it is the key that fits the lock of everybody's heart."

1.How can people with angina get better according to the study?

A.By expecting more. B.By thinking positively.

C.By getting timely surgery. D.By taking more exercise.

2.What may be Alexander Fanaroff’s next research?

A.To explore how to improve patients’ attitudes.

B.To find out the ways to treat heart patients.

C.To learn the causes of heart diseases.

D.To test if positive attitudes help with health.

3.What can we learn from the text?

A.Optimistic people hardly get heart attack.

B.People's attitudes decide their overall health.

C.How positive thinking benefits heart health is unclear.

D.The reason why patients recover well is that they have no depression.

4.What may be the best title for the text?

A.Keep positive to get rid of illness

B.Angina, a kind of serious condition

C.Depression, a key cause of heart attack

D.Positive thinking makes hearts healthier