随着电子邮件的广泛应用,电子邮件面临的安全威胁越来越多。以下属于安全威胁的是()
A垃圾邮件
B邮件病毒
C邮件炸弹
D邮件拦截
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Scientists reported that more than 320 kinds of chemical components______in the tea leaves.
A. are contained
B. is contained
C. contains
D. contained
It takes a lot of______to overcome a physical handicap.
A. grip
B. grin
C. grid
D. grit