题目内容

I have read the whole article and the ______ paragraphs seem to be quite difficult.

A. first three
B. first third
C. three first
D. third first

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A. 1
B. 2
C. 3
D. 4

A. 254
B. 512
C. 1022
D. 1024

A. 192.47.16.254和192.47.32.25
B. 192.47.16.254和192.47.17.01
C. 192.47.17.01和192.47.33.05
D. 192.47.17.01和192.47.32.25

A. 255.0.0.0
B. 255.255.0.0
C. 255.255.252.0
D. 255.255.255.0