50.What does the underlined word "seat”in the last paragraph most probably mean?

• A、Focus.

• B、Position.

• C、Chair.

• D、Center.

(56)__

52.According to Paragraph 1,which of the following statements is TRUE of Mark Twain?

• A、He left behind lots of money.

• B、His works were written for children.

• C、His works are full of adventures.

• D、He is famous for his great works.