阅读下列材料，从每题所给的四个选项(A、B、C和D)中，选出最佳选项。
A
Including the following food or fruit in your breakfast makes you healthier and full of energy.
Grapefruit
“Even if you changed nothing else about your diet, eating half a grapefruit before each meal may help you lose up to a pound a week，” says Patricia Bannan, author of EatRightWhentheTimeIsRight. “Researchers found that when obese people ate half a grapefruit before each meal, they dropped an average of 3.5 pounds over 12 weeks，” she says.
Tart Cherry
Tart cherries have been shown to benefit heart health as well as body weight in a study on obese rats. A 12week study by the University of Michigan found that rats fed tart cherries showed a 9 percent belly fat reduction. Moreover, the researchers noted that the cherry consumption had great ability to alter the expression of fat genes. Enjoy them during breakfast to kick your morning off right.
Sweet Potato
Sweet potatoes are packed with nutrients and can help you burn fat. They are high in fiber and have a low glycemic index (血糖指数), which means they are absorbed slowly and keep you feeling full longer. Min Chen likes to use them to whip up a sweet potato hash. “I love any kind of this dish because it provides rich vitamins, minerals and fiber. It is very filling, which helps keep appetite and portions under control as the day goes on，”she says.
Bell Pepper
Green, red or yellow, fresh or frozen, peppers are never a bad companion for your eggs. Thanks to their high vitamin C content, eating them can help burn stored fat. Studies also indicate that Vitamin C helps muscles process a fatty acid called carnitine that's essential to muscle growth and recovery.
21．Which food or fruit is beneficial to the patients who suffer from heart diseases?
A．Grapefruit. B．Sweet potato. C．Tart cherry. D．Bell pepper.
22．What benefit do these food and fruit have in common?
A．Making people live longer.
B．Making muscles grow strong.
C．Helping control glycemic index.
D．Helping people lose weight.
23．In which part of a newspaper can you read the text?
A．Education. B．Health. C．Agriculture. D．Technology.
