题目内容：

    Do potatoes play a small role on your dinner table？If so，get ready for a_big_change!

Potatoes are becoming China's fourth staple food(主食)after rice，wheat and corn.Using potatoes as a staple can make our diets healthier and more balanced(均衡的)．They are good for us in many ways.

Potatoes are nutritious(有营养的)．They are rich in vitamin C．A potato's vitamin C is as rich as 10 apples. Potatoes are also low in calories(卡路里)—they have just 75 percent of the amount of calories that wheat and corn have.

Also，potatoes are easy to grow. People can grow them in almost every part of China. Potatoes don't need much water to grow. China is facing water shortage(不足)problems，so potatoes are a good choice.

Many Chinese people think potatoes are like vegetables. They cook potatoes along with other ingredients(原料)．But as a staple, potatoes can be cooked differently. Scientists have found ways to make potato flour，noodles and other staple foods，just like how we use rice or wheat.

1.What does the phrase “a_big_change” in Paragraph 1 mean?

A.Potatoes play a small role on the dinner table. B.Potatoes will be eaten more often.

C.People will stop eating potatoes. D.There will be many new kinds of potatoes.

2.Which of the following plants is China's fourth staple food?

A. B. C. D.

3.Why are potatoes better than other staple foods?

A.Because they are low in vitamin C.

B.Because they do not have very many calories.

C.Because they are heavier than other staple foods.

D.Because they can make people feel full more easily.

4.Paragraph 4 mainly tells us that ______.

A.potatoes can be grown all over the country B.potatoes do not need much water

C.China doesn't have much water D.potatoes are easy to grow

5.What have scientists tried to do?

A.Make potatoes taste like real vegetables. B.Use potatoes to cook new dishes.

C.Use potatoes to create staples like noodles and flour. D.Cook potatoes along with rice and wheat.