China's government pledged to work on the quality of Beijing's air before the 2008 Olympics. As a result of the efforts, pollutants in the atmosphere were reduced by as much as Question 21 options: A.75%. B.85%. C.45%. D.20%.

the answer is: c. c.it limited the president’s power to start wars.

the war powers resolution of 1973 requires the president to notify the congress whenever the president wanted to order a military operation to other countries within 48 hours. if after being reviewed the congress disagree with the proposal, that the president will be banned from ordering the operation.

answer; the automatic system because it is a "gut reactor"  

answer; coal reserves in the u.s are far greater than petroleum reserves;