There are ten multiple-choice questions in this section. Choose the best answer to each question. Mark your answers on your answer sheet.
It is taken as a great contribution made by ______ that languages in the world are classified into different language families according to their genetic relations.

A．Its reputation as a "chick car".
B．Its folded top sits above a tiny trunk, with only five cubic feet of capacity and accessible through a smaller porthole.
C．Crank the steering into a turn and the car follows like an eager puppy.
D．As with the New Beetle hatchback, the windshield is far away, and the wipers clear only a small slit of a view in front.

A．Persuasion.
B．Summarization.
C．Argumentation.
D．Cohering.