The best title for this passage is ______.

A．Most educated people study both sides of a question.
B．Heterodox speculation will lead to many errors in thinking.
C．The vast majority of people who argue fluently are acquainted with only one side of an issue.
D．It is wise to get both sides of a debatable issue from one's teachers.

A．To provide liquidity to the market.
B．To keep a close watch on Wall Street, if there is a stock market crash, it will lower interest rates.
C．To observe the influence of a sliding market on consumer confidence and give a timely response.
D．To prevent the stock market from sliding too muc