【单选题】

Directions: After reading the following passage, you will find 5 questions or unfinished statements, numbered 36 to 

40. For each question or statement there are 4 choices marked A、, B、, C、, and D、. You should make the correct choice and mark the corresponding letter on the Answer Sheet with a single line through the center.
39. We can learn from the last paragraph that One-world   
A、 offers the lowest prices to its passengers   
B、 keeps passengers better informed of its operations   
C、 offers better services than any of its member airlines alone   
D、 is intended to make round-the-world trips more challenging   
40. The purpose of the advertisement is to   
A、 promote a special flight program   
B、 recommend long distance flights   
C、 introduce different flights   
D、 describe an airlines group