Questions 17—20 are based on the following passage, about the Olympic Games. You now have 20 seconds to read Questions 17—20 What is the basic honor in taking part in the Olympic Games

A．They paid no special attention to information about the production and the price of wheat.
B．They might casually take the growing of wheat as a topic of conversation.
C．They also grew wheat in their backyards.
D．They were as much concerned with the wheat production and selling as the farmers.

A．The deficiencies of the library in providing information.
B．The different applications of the computer and the library.
C．The advantages and disadvantages of the computer and library.
D．The advantages of the computer in search of information.

A．It's of significance to make different reactions to the same things.
B．Scientific reasearch is unreliable owing to the different observations.
C．People try their best to make impartial observation.
D．The way of observation varies from person to person.