在教学活动过程中的问答行为中，教师提的问题不能太难，但一次可以提多个问题。()

A. present more factual details to clarify the issue
B. present an alternative theory for consideration
C. present a recommendation from a reputable source
D. present a solution drawn from all the evidence considered

A. the stock market crash of 1929 was an entirely positive event
B. the crash of the stock market was a foreseeable, and thus avoidable event
C. the stock market crash of 1929 resulted in short-term losses but long-term useful effects
D. the stock market crash of 1929 was the defining event of the twentieth century economics

A. criticize that the Atlanta Games was unfair due to the absence of some athletes
B. state that it"s critical to make thorough transport scheme to host the Olympic Games
C. manifest that the site picking of London is far better than that of Atlanta
D. prove that Olympic bids must take tube and rail construction into account

A. those who need a college education most are having the most difficulty getting it
B. student loans are improving access to education for all
C. high-income families benefit most from student loans
D. low to moderate-income families benefit most from student loans