A.Cho lá Al vào dung dịch H2SO4 loãng.
B.Cho hợp kim Fe - Cu vào dung dịch HCl.
C.Nhúng thanh Cu vào dung dịch Fe2(SO4)3.
D.Đốt dây thép trong bình đựng khí O2.

A.Ở điều kiện thường, triolein là chất lỏng.
B.Anilin làm mất màu nước brom.
C.Phân tử Val-Ala-Lys có bốn nguyên tử nitơ.
D.Dung dịch glyxin làm đổi màu phenolphtalein.

A.Ala-Gly-Ala, glucozơ, anilin, axit glutamic.
B.Glucozơ, Ala-Gly-Ala, anilin, axit glutamic.
C.Ala-Gly-Ala, anilin, glucozơ, axit glutamic.
D.Axit glutamic, anilin, glucozơ, Ala-Gly-Ala.

A.8,90.
B.13,35.
C.22,25.
D.17,80.

A.is too cold to be thoroughly studied
B.maintains the same shape throughout the glacial process
C.can contribute water to lakes, rivers, or oceans
D.can revert to a fluffy mass

A.timetable
B.programme
C.itinerary
D.schedule

A.Traditions of Masai people when having a new baby
B.Celebrations in Africa
C.Activities in a birth celebration
D.Birthday ceremonies for children in Africa

A.at the village church
B.near the thorn fence
C.on the cattle farm
D.at their house

A.Children are initiated for a mature life in the presence of their friends and family.
B.Children have to overcome a few trials to enter the grown-up world.
C.Children have to learn their tribes' cultures and traditions when they are old enough.
D.An eight-day-old child will be taken for the first walk by his or her mother.

A.commence
B.participate in
C.experience
D.explore