The policy the United States actually pursued in the first two years of WWI was（）

A.natural conservation
B.the construction of irrigation projects
C.the setting-up of the Federal Reserve Board and twelve Federal Reserve Banks
D.the introduction of tariff increase and a low income tax

A.the banning of child labor
B.the giving of voting right to women
C.in the field of natural conservation
D.in urban renovation

A.initiate strict government regulation
B.have the government to fix prices
C.break up all the big businesses
D.do away with rebates