A．Professor and student.B．Shop assistant and customer.C……

单项选择题A．She married twice.B．She does not like baby.C．She likes to do housework.D．She envies her sister.

单项选择题A．It has become a clumsy giant.B．The city has suffered from lung-time famine.C．There was an epidemic disease that time.D．It has been set on fire.

单项选择题A．ballet.B．Swimming.C．Nursing.D．Teaching

单项选择题A．For hunting.B．For protecting himself.C．For stimulation.D．For protecting the country.

单项选择题A．It’s near Mexico City.B．It’s in Guatemala.C．It’s stretched from the plains of central Mexico to the mountains of Guatemala.D．It’s in America.

单项选择题A．Same height.B．Same friends.C．Same number of children.D．Same university.

单项选择题A．Commenting on a picture.B．Looking at some paintC．Painting a picture.D．Comparing two paintings.

填空题Calcium - rich food ______ its supplements because it also provides other nutrients like vitamin D and other minerals.

填空题Calcium permits cells to divide, regulates muscle contraction and relaxation, and plays an important role in the movement of protein and nutrients inside cells besides helping ______ .

填空题If you want to have strong bones you should eat food ______ .