瀑布模型由W.Royce在1970年首先提出，它根据软件生存周期各个阶段的任务从需求分析开始，逐步进行阶段性变换，直至通过确认测试并得到用户确认的软件产品为止。
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What are good for healthy eating?
A. Count calories
B. Reduce sweets
Cut down on fatty foods
D. All of the above
Apples, peppers and tomatoes are good for your.
A. heart
B. stomach
C. bones
D. teeth
People can get good eyesight by eating
A. corn
B. carrots
C. pumpkins
D. All of the above
According to the article, what do grapes and blueberries do?
A. They make our teeth and bones grow stronger.
B. They improve our memory and strengthen our hearts.
C. They help blood flow and battle against cancer.
D. They help us breathe better and lessen allergic reactions.
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