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【单选题】
What comments can be made on their way of getting into the U.S.?A.
It's the most common way.
B.
It's the most successful way.
C.
It's the most unusual way.
D.
It's the least expensive way.
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【单选题】设向量组α1，α2，α3线性无关，则下列向量组线性相关的是( )．
A.
α1+α2，α2+α3，α3+α1
B.
α1，α1+α2，α1+α2+α3
C.
α1-α2，α2-α3，α3-α1
D.
α1+α2，2α2+α3，3α3+α1
【单选题】Completed in 1974 in Chicago, ________used to be the tallest building in the world.
A.
The Sears Tower
B.
The Twin Towers
C.
The Empire state building
D.
The Chrysler Building
【单选题】In 1893, The Transportation Building at the "World's Columbian Exposition" in ________ featured railroad exhibits and equipment from around the world.
A.
Washington D.C.
B.
Chicago
C.
Newyork
D.
Boston
【单选题】从供选择的答案中,选出应填入 的正确答案 已知文法G[S]的产生式如下: S → (L)|a L → L,S|S 属于L(G[S])的句子是
A.
a
B.
a,a
C.
(L)
D.
(L,a)
【简答题】把他自己融入电影 (第一空填4 words) 终身信念 (第2空填2 words)
【简答题】设有文法G(S)：S→SS*｜SS＋｜a (1)G(S)的语言L(G(S))是什么? (2)下列字符串哪些是该文法的句子? $1：aa＋aa*＋a $2：aa＋aaa*＋＋ $3：aS＋a* (3)对属于该文法的句子$i，画出其分析树。
【单选题】为下列文法选择最准确的答案： 文法G[S]属于(12)： S→CD Ab→bA C→aCA Ba→aB C→bCB Bb→bB AD→aD C→s BD→bD D→c Aa→bD L(G)={ww|w∈{a,b)*) 文法G[冈属于(13)： P→0A|1B|O A→0A|1B|0P B→1B|1|0 文法G[1]属于(14)： I→1T I→1 T→1T T→dT T→1 T→d 其中，1表示a...
A.
1型(上下文有关)文法
B.
2型(上下文无关)文法
C.
定义标识符的3型(正规)文法
D.
0型文法
【简答题】It was a hot Chicago day in August when Mike’s fire-fighting crew ( 消防 队 ) tried to manage a fire in a building. “It was hopeless ( 没有希望的 ) to put out the fire 1 of the strong wind,” says Mike. By the...
【单选题】The Chicago History Museum has one of America’s largest collections of architectural working drawings, as well as manuscript materials, photographs, architectural models, and building fragments .
A.
components
B.
substances
C.
monocultures
D.
debris
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