Some scholars believe that American President Hoover is not a typical representative of laissez-faire policy, and he also intervened in the economy to a limited extent, which is the later Ross.

Analysis of test questions: The key to examining the background of Roosevelt's New Deal lies in the limited intervention in the economy and other key information. AB is the product of laissez-faire policy, and C is the government intervention during Roosevelt's New Deal. Item d is a limited intervention needed in the later general election, so choose D.