题目内容：

High levels of chocolate consumption might be associated with a one third reduction in the risk of developing heart disease, suggests a study published online in the British Medical Journal. The findings confirm results of existing studies that generally agree on a potential beneficial link between chocolate consumption and heart health. However, the authors stress that further studies are needed to test whether chocolate actually causes this reduction or if it can be explained by some other unmeasured factor.

The World Health Organization predicts that by 2030, nearly 23 6 million people will die from heart disease. However, lifestyle and dict are key factors in preventing heart disease, says the paper, A number of recent studies have shown that eating chocolate has a positive influence on human health due to its antioxidant and anti-inflammatory properties. This includes reducing blood pressure and improving insulin sensitivity.

However, the evidence about how eating chocolate affects your heart still remains unclear. So, Dr Oscar Franco and colleagues from the University of Cambridge carried out a large scale review of the existing evidence to evaluate the effects of eating chocolate on cardiovascular(心血管)events like heart attack and stroke.

They analyzed the results of seven studies, involving over 100,000 participants with and without existing heart disease, For each study, they compared the group with the highest chocolate consumption against the group with the lowest consumption.

Five studies reported a beneficial link between higher levels of chocolate consumption and the risk of cardiovascular events. They found that the “highest levels of chocolate consumption were associated with a 37% reduction in cardiovascular disease and a 29% reduction in stroke compared with lowest levels.” No significant reduction was found in relation to heart failure.

The authors say the findings need to be interpreted with caution, in particular because commercially available chocolate is very calorific (around 500 calories for every 100 grams)and eating too much of it could lead to weight gain, risk of diabetes and heart disease.

However, they conclude that given the health benefits of dating chocolate, initiatives to reduce the current fat and sugar content in most chocolate products should be explored.

1.Which statement is NOT true according to the passage?

A. There used to be studies about the beneficial link between chocolate consumption and heart health.

B. Millions of people will die from heart disease according to the WHO

C. There are still other factors that may reduce the risk of heart disease.

D. There is clear evidence about how eating chocolate affects your heart.

2.What are the possible causes of heart disease ?

A. Eating chocolate

B. Unhealthy diet

C. Exercising regularly

D. Drinking coffee.

3.What’s the authors’ attitude towards the findings?

A. cautious

B. doubtful

C. disapproving

D. negative

4.What can be inferred from the last paragraph?

A. We should eat less chocolate.

B. Chocolate benefits our health.

C. We should consider the fat and sugar problem.

D. Eating chocolate will lead to fat gain naturally.