Calcium permits cells to divide, regulates muscle contraction and relaxation, and plays an important role in the movement of protein and nutrients inside cells besides helping ______ .

填空题If you want to have strong bones you should eat food ______ .

填空题Fruits, such as watermelon, red grapefruit, and guava, are now exciting the interest of researchers because ______ .

填空题A study shows that men who eat tomato products twice a week could probably avoid developing prostate cancer by one third in comparison with those ______ .

填空题Investigators don’t ______ how many phytochemicals exist and how they work.

填空题Researchers say that supplements can completely take the place of real food in the near future.

填空题It is proved that the uncontrolled activity of free radicals caused many cancers.

填空题The author suggested that people should eat more fruits, vegetables, and plant-based foods, eat less high-fat, high- calorie foods with insufficient nutritional value, stop smoking, exercise often and control their weight in order to reduce cancer.

填空题According to this passage, a diet high iii plant-based foods plays an important role in fighting all kinds of diseases.

问答题1. Energy crisis is one of the main problems facing the world today.2. Importance of energy.3. Conserving energy.

单项选择题Which of the following conclusions is best supported by the second paragraph