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A new study says that few nutritional supplements can protect people from developing or dying from heart disease. The researchers say there is little evidence supporting the use of nutritional supplements. Yet about half of U.S. adults take at least one supplement to improve their health.
The researchers did find evidence that reduced use of salt was linked to a lower risk of dying from all causes among people with normal blood pressure. Some supplements also appeared to have a good effect on human health. Omega-3 fatty acids appeared to lower the risk of heart attack and heart disease in adults. Also, folic acid, a kind of vitamin B, appeared to lower the risk of strokes: blockages of blood flow that can damage the brain or cause death.
_______, the study suggested that combining calcium and vitamin D might increase the risk of stroke. The researchers said there was enough evidence to suggest that people should not start taking supplements if they want to prevent heart problems.
Eric Topol is an official with Scripps Research in La Jolla, California. He told the Reuters news agency that he agreed with the findings. “There are no convincing data that any vitamin or supplement reduces heart attacks,” he said. The lead author of the report was Safi Khan of the University School of Medicine in Morgantown, West Virginia. “People should focus on a healthy diet from nutritional food sources, not vitamins or supplements, in combination with healthy lifestyle which includes regular physical activities and not smoking,” he wrote.

1.Which of the following statements is NOT true according to the passage?

A Few American adults take supplements to improve their health.

B Combining calcium and vitamin D might increase the risk of stroke.

C Omega-3 fatty acids appears to reduce the risk of heart disease in adults.

D Eric Topol says vitamins or supplements are no good to reduce heart attacks.

解析：选A。细节理解题。由第一段最后一句Yet about half of U.S. adults take at least one supplement to improve their health.可知，大约有一半的美国成年人至少服用一种营养补充剂来改善健康状况，故选A。

2.What can we learn according to Safi Khan? ① People should not smoking. ② People should do regular physical activities. ③ People should focus on healthy diet. ④ People should take vitamins or supplements.

A ① ③ ④

B ② ③ ④

C ① ② ③

D ① ② ④

解析：选C。细节理解题。由最后一段可知，Safi Khan认为人们应该关注健康食品，而不是维生素或营养补充剂，并结合健康的生活方式，包括定期体育锻炼和不吸烟，① ② ③项符合，故选C。

3.Which of the following can be put in the blank in Paragraph 3?

A However

B For example

C As a result

D Therefore

解析：选A。推理判断题。根据上一段主要讲述了少盐饮食、一些营养补充剂、omega-3脂肪酸和叶酸对人类健康的好的影响；而横线后主要介绍了研究表明钙和维生素D的结合可能会增加中风的风险，前后为转折关系，故选A。

4.Why did the author write this passage?

A To encourage people to do more physical activities.

B To encourage people to pay attention to heart disease.

C To encourage people to take more vitamins or supplements.

D To encourage people to have a healthy diet and lifestyle.

解析：选D。主旨大意题。文章主要介绍了维生素或营养补充剂并不能减少心脏病发作和降低患心脏病的风险，提倡人们关注健康食品和健康的生活方式，而不是维生素或营养补充剂，目的是鼓励人们健康饮食，拥有健康的生活方式，故选D。

5.The text is probably in the “_________” part of a newspaper.

A Advertisement

B Health

C Technology

D Art

解析：选B。推理判断题。文章与健康有关，最有可能出现在报纸的健康版块，故选B。