题目内容

抗原是指进入人或动物细胞内能和( )结合或和( )结合,引起人或动物免疫反应的任何体外物质。

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Exercise 1It seemed that we couldn't live a ____without electricity.

In summer vacation, many college students choose to take part in all kinds of ____.

If you have a good attitude and a ____, you are sure to get a good job.

Jackson is very hard-working and he has attended ____classes after work every day.

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