单项选择题


Questions 17-20 are based on the following passage. You now have 15 seconds to read Questions 17-20.
Which of the following statement is NOT true

A.A study by Cesar Fraga of the University of Buenos Aires in Argentina confirmed healthy activity in the blood after eating dark chocolate.
B.Chocolate is produced from beans that contain large amounts of natural substances called flavonoids.
C.Research has shown that 14 grams of milk chocolate contain about four-hundred milligrams of flavonoids.
D.Flavonoids have been shown to protect the heart and the blood vessels from damage.