He feels ______today than yesterday.
A. tired
B. more tired
C. more tireder
D. much tired
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Why__________Tom absent today ?
A. be
B. is
C. are
D. does
Look! The twins _____ new sweaters.
A. are wearing
B. wearing
C. are wear
D. is wearing
Don't talk here. Grandparents _____.
A. is sleeping
B. are sleeping
C. sleeping
D. sleep
[WJ-500-400]以下哪种技术不是实现防火墙的主流技术( )。
A. 包过滤技术
B. 应用级网关技术
C. 代理服务器技术
D. NAT技术