Do you eat potatoes often? Some people seldom eat them. But now, it's time to make a big change. Potatoes are now China's fourth staple food（主食）after rice, wheat and corn（小麦和玉米）. Using potatoes as a staple can make our eating healthier and more balanced. They are good for us in many ways.
Potatoes are nutritious. They are rich in vitamin C, just like apples. A potato's vitamin C is as much as 10 apples. Potatoes also have few calories（卡路里）—much fewer than wheat and corn. Also, potatoes are easy to grow. People can grow them in different places of China, even in dry places. They don't need much water. Some places in China are having water problems, so potatoes are a good choice.
Many Chinese people think potatoes are only vegetables. They cook potatoes with other food. But as a staple, people can cook them differently. Scientists have found ways to make potato flour（面粉）, noodles and other staple foods, just like how we use rice or wheat.
()1. How does the writer introduce the topic at the start?
A. By telling a story.
B. By asking a question.
C. By showing the number.
D. By explaining the result.
()2. What does the word “nutritious” in the second paragraph mean?
A. Good for health.
B. Nice and delicious.
C. Easy to cook.
D. Easy to grow.
()3. What can we guess about the future of potatoes in China?
A. People may stop eating them.
B. All farmers may grow potatoes in south China.
C. More people may eat potatoes as a staple.
D. Potatoes will bring water problems in China.
()4. What is the best title of the passage?
A. Rice or Potatoes?
B. Potatoes in the World
C. Potatoes—A New Staple in China
D. How to Grow Potatoes

1~4. BACC