矽卡岩是硅钙形成的岩石。()

A. They are indifferent to them.
B. They never speak to them.
C. They try to be friendly to them.
D. They don"t want to know them.

A. University of Central England has a longer history than City University, London.
B. University of Central England contributes to the country"s high-tech development
City University, London has more students than University of Central England.
D. City University, London is located in the north of London.