Scientists have learnt a grate deal about the kinds of food people need.

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• 英语翻译Scientists have learned a great deal about the kinds of foods__1___.They say that there are seven kinds of foods that people should eat every day.They are:(1)green and yellow vegetables of all kinds,__2___string beans,carrots and peas;(2)citrus fruits(柑橘水果)and tomatoes;(3)potatoes__3__fruits and vegetables;(4)meat of all kinds,fish and eggs;(5)milk and foods__4__milk such as chese and ice cream;(6)bread or cereal(谷物).Rice is also in this class of
• Scientists have learnt a lot _________the kinds of food people need.
• Scientists have learnt a grate deal about the kinds of food people need.
• Scientists have learnt a lot _________the kinds of food people need.A.ofB.fromC.aboutD.at顺便帮我讲一下哈
• Scientists have learnt a grate deal about the kinds of food people need.
• 先观察,然后想一想其中的规律.再计算.
• 求e^兀i＋1的值．