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

A.
B.
C.
D.

A.
B.
C.
D.

A.
B.
C.
D.

A.
B.
C.
D.

A.
B.
C.
D.

A.Vôi sống.
B.Xi măng.
C.Thủy tinh.
D.Đồ gốm.