题目内容
（请给出正确答案）
m of pollution in the country, but halfway in her speech, she suddenly _________ to another subject.
A) committed B) switched
C) favoured D) transmitted
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A.The boy in red shorts is the first
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设有产生式：A→a｜β｜γ，且α、β、γ
ε。则在自上而下语法分析中，对A推导不带回溯的条件是_______。
A．FIRST(a)N FIRST(8)N FIRST(y)＝Ф
B．FIRST(a)N FIRST(β)＝Ф与FIRST(β)∩FIRST(y)＝Ф与FIRST(a)∩FIRST(y)＝Ф
C．FIRST(a)∪FIRST(8)∪FIRST(y)＝Ф
D．FIRST(a)∩FIRST(β)＝Ф或FIRST(β)∩FIRST(y)＝Ф或FIRST(a)∪FIRST(y)＝Ф
A.on
B. in
C. at
D. for
A.soup
B.sweet
C.vegetable
