In July 1789, ten amendments added to the American constitution limiting the powers of federal government and protecting the rights of all citizens were called

A．a picture that you have in your mind, especially about what someone or something is like or the way they look.
B．a technical process in which pictures of the inside of someone’s body are produced.
C．the process of making a scientific or computer model of something to show how it works or to understand it better.
D．the opinion people have of a person, organization, product etc.

A．Species like the dinosaurs brought the ice ages to an end.
B．A volcanic eruption might lead to a great catastrophe.
C．Today’s change is mainly caused by agricultural advances.
D．Today’s change attributes to a multitude of reasons.