题目内容

Last year, John earned ____ his brother, who is less capable.

A. three times as more as
B. three times as much as
C. twice as many as
D. twice worse

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___Are you going to the concert in the 21st Century Hotel?___No, the tickets are ____ for me.

A. much far expensive
B. so much expensive
C. too far expensive
D. far too expensive

We need ____ information before we can decide.

A. far
B. farther
C. further
D. furthest

请简述分组交换的优缺点

数字信号是指___和___两个方面都离散的信号。

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