21.The train set off from ______.

A.the east of the United States

B.the west of the United States

C.the south of the United States

D.the middle west of the Untied States

22.When the young woman saw the two men,she smiled at them because ______.

A.she wanted to be polite to the other passengers

B.she recognized Easton,who was a friend of hers

C.she was glad to have someone to talk to in the coach

D.she thought it was funny for two men to be linked together

23.When the heavily-built man asked the pretty woman to speak a word for him,he wanted to ______.

A.save Easton from embarrassment

B.reduce his own suffering in prison

C.strike up a conversation with the attractive woman

D.help Easton to carry on the conversation with the woman

24.What does the phrase“catch on”in the last paragraph mean?

A.Notice his face.B.Understand.

C.Listen to the conversation.D.Carry on.

25.The conversation between two other passengers at the end of the passage suggests that the heavy-built man is a ______.

A.prisoner B.bad guy

C.friend of Easton D.marshal