_________is one of the design features of language which refers to the concept that human languages enable their users to symbolize objects, events and concepts which are not present (in time and space) at the moment of communication. It benefits human beings by giving them the power to handle generalizations and abstractions. A: Arbitrariness B: Displacement C: Duality D: Creativity

Speeches about concepts are more abstract than objects, events and processes.

中国大学MOOC:"Speeches about concepts are more abstract than objects, processes or events and are thus more complex and difficult to handle.";

English is subject-centered, which is inclined to adopt abstract concepts, feelings, objects, time or place as the subject. ( )

The following methods can be applied to present vocabulary EXCEPT___. A: Pictures, diagrams or maps B: Using real objects C: Using gestures or expressions D: Passing on words