The color of one’s skin should be no_________ to success in life.
A. bar
B. barrier
C. prevention
D. persuasion
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She was _________ aimlessly up and down the road.
A. wondering
B. wandering
C. winding
D. strolling
The plans didn’t _________ on time because of the dense fog.
A. take off
B. take up
C. take to
D. take after
He keeps illness_________ bay by eating lots of oranges
A. at
B. in
C. by
D. to
假如用5个路由器将6个网络互连，使用链路状态路由算法，需要（）个路由表。
A. 1
B. 5
C. 6
D. 11
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