A.They preserve flavor in packaged foods. B.They preserve the color of meats. C.They are the objects of research. D.They cause the animals to become fatter.
A.mates B.relatives C.members D.fellows
A.较有趣的课程内容 B.最重要的、最具影响力的概念 C.有趣且与当前课程有一定关系的内容 D.重要且有趣的内容
A.理论性 B.实践性 C.趣味性 D.教育性
A.As a result B.After all C.In other words D.Above all
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