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【单选题】
下列文法: E → E + E E → E * E E → ( E ) E → i 对于串 i+i*i 的最左推导过程是( )A.
E⇒E*E⇒E+E*E⇒i+E*E⇒i+E*i⇒i+i*i
B.
E⇒E*E⇒E*i⇒E+E*i⇒E+i*i⇒i+i*i
C.
E⇒E+E⇒E+E*E⇒E+E*i⇒E+i*i⇒i+i*i
D.
E⇒E+E⇒i+E⇒i+E*E⇒i+i*E⇒i+i*i
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【单选题】Are you a new student?
A.
Yes, I just came here this September.
B.
I'm six years old.
C.
I'm from Canada.
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【单选题】Ways must be found to _____ the poisonous gases ____ polluting the air.
A.
protect ... from
B.
defend ... against
C.
pr... from
D.
compare... with
【简答题】Ways must be found to pr the poisonous gases _____ polluting the air.