A.Fe2O3, NO2, O2.
B.Fe, NO2, O2.
C.Fe2O3, N2O, O2.
D.FeO, NO2, O2.

A.C6H5CH2CH3.
B.C6H4-CH=CH2.
C.C6H5CH3.
D.CH3-C6H4-CH3.

A.butilen.
B.axetilen.
C.etilen.
D.propen.

A.Na2CO3.
B.KOH.
C.HCl.
D.H2S.

A.How to succeed in love every minute of your life.
B.How to turn failure into success.
C.How to make a millionaire.
D.How-to books.

A.advice
B.instruction
C.how-to books
D.career

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B.
C.
D.

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B.
C.
D.

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B.
C.
D.

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B.
C.
D.