填空题

填空题 A large study of 500,000 American retirees has found that just ______ of fruit or vegetables a day may reduce the risk of developing head and neck cancer.

填空题 Cancer experts now believe that up to ______ of all cancers come from lifestyle factors such as smoking, diet and lack of exercise.

填空题 What kind of cancer is the sixth-leading cause of cancer-related death worldwide?

填空题 ______ use increases the risk of head and neck cancers, which affect the mouth, nose, sinuses and throat.

填空题 The study found that people who ate the largest amounts of flavonols had a ______ reduced risk of developing pancreatic cancer compared to those who ate the least.