单项选择题A.Two different types of bones in the human body.B.How bones help the body move.C.How bones continuously repair themselves.D.The chemical composition of human bones.
单项选择题A.He had psychic powers.B.He was an educated man.C.He went to school at the age of six.D.He died in 1929.
单项选择题A.Energy conservation.B.A new kind of transportation.C.Strip cities.D.Advantages o air transportation over rail roads.
单项选择题A.She felt proud.B.She felt satisfied.C.She felt delighted.D.She felt surprised.
单项选择题A.He is very quiet.B.He gives amusing lectures.C.He should give more than one series of talks.D.He lectures only to the serious students.