I use pencils ___ art class.
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——Are you ready ____ school, Jim?—— Yes, Dad.
A. to
B. at
C. for
D. /
—— _______ he have his English dictionary?—— No, he doesn't.
A. Do
B. Does
计算并填写设IP地址为191.173.21.9子网掩码为255.240.0.0则
分类编址下,IP地址192.1.1.3对应的直接广播地址是()。
A. 192.1.1.0
B. 192.1.1.255
C. 192.1.1.1
D. 192.1.1.3