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【简答题】
设有下列文法： S→S，E｜E E→E＋T｜T T→T*F｜F F→a｜(E)｜a[S] (1)指出下列字符串哪些是该文法的句子： $1：a＋a[aa＋[a]] $2：a*a，a＋a[a] $3：a，a＋a[a[S]] (2)对属于该文法的句子$i画出自上而下分析树。
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举一反三
【简答题】They have never met, but they have been in ________ with each other for years.
【单选题】They have never met, but they have been in__________with each other for years.
A.
letter
B.
note
C.
correspondence
D.
paper
【单选题】设有下列声明语句 : int i,j; float x,y; double u,v; 下列哪些赋值是合法的 ?( )
A.
i=x;
B.
x=u+y;
C.
v=x
D.
y=u+i*x
【单选题】设有下列声明语句: int i,j; float x,y; double u,v; 下列哪个赋值是合法的?( )
A.
x=u+y;
B.
i=x;
C.
x=v
D.
y=ji*x
【简答题】细胞的形态结构与( )的相关性和一致性是很多细胞的共同特点。
【单选题】设有下列声明语句: int i,j; float x,y; doubleu,v; 下列哪些赋值是合法的?( )
A.
i=x;
B.
x=u+y;
C.
v=x
D.
y=j/i*x
【单选题】Children are often ______ about everything they have never met before.
A.
familiar
B.
content
C.
curious
D.
satisfied
【简答题】Fill in each of the blanks with a correct word or phase: handicap, physical, junk, accent, a couple of, witness, tucked, correspondence, issue, trial They have never met, but they have been in ______ ...
【单选题】If your friend have a crash on someone on Wechat and they have never met each other, you should_____.
A.
. think her/his behavior is so silly and pay no attention to it.
B.
to blame him/her .
C.
Tell him/her to enlarge the of real-life friends.
D.
Do the same thing as him/her.
【简答题】细胞的 与 的相关性和一致性是很多细胞的共同特点
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