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【简答题】
设 Z n =( 1-i 2 ) n ，n∈Z + ，记S n =|Z 2 -Z 1 |+|Z 3 -Z 2 |+…+|Z n+1 -Z n |，则 lim n→∞ S n =______．
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举一反三
【单选题】What is the outstanding feature of the book H is for Hawk?
A.
Beautiful language in the book.
B.
Truthful recording of the facts.
C.
Miserable and touching story.
D.
Enthusiasm conveyed through the book.
【单选题】I asked the shopkeeper how much______.
A.
costs the book
B.
the book costs
C.
does the book cost
D.
does cost the book
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