大全TEST-15-12，13为什么是以下答案？

12.   The only purpose for which a particular type of tape is needed is to hold certain surgical wounds closed for ten days—the maximum time such wounds need tape. Newtape is a new brand of this type of tape. Newtape’s salespeople claim that Newtape will improve healing because Newtape adheres twice as long as the currently used tape does.

Which of the following statements, if true, would most seriously call into question the claim made by Newtape’s salespeople?

(A) Most surgical wounds take about ten days to heal.

(B) Most surgical tape is purchased by hospitals and clinics rather than by individual surgeons.

(C) The currently used tape’s adhesiveness is more than sufficient to hold wounds closed for ten days.

(D) Neither Newtape nor the currently used tape adheres well to skin that has not been cleaned.（C）

(E) Newtape’s adhesion to skin that has been coated with a special chemical preparation is only half as good as the currently used tape’s adhesion to such coated skin.

我选的是A，为什么不对？

13.   A severe drought can actually lessen the total amount of government aid that United States farmers receive as a group. The government pays farmers the amount, if any, by which the market price at which crops are actually sold falls short of a preset target price per bushel for the crops. The drought of 1983, for example, caused farm-program payments to drop by $10 billion.

Given the information above, which of the following, if true, best explains why the drought of 1983 resulted in a reduction in farm-program payments?

(A) Prior to the drought of 1983, the government raised the target price for crops in order to aid farmers in reducing their debt loads.

(B) Due to the drought of 1983, United States farmers exported less food in 1983 than in the preceding year.

(C) Due to the drought of 1983, United States farmers had smaller harvests and thus received a higher market price for the 1983 crop than for the larger crop of the preceding year.

(D) Due to the drought of 1983, United States farmers planned to plant smaller crops in 1984 than they had in 1983.（C）

(E) Despite the drought of 1983, retail prices for food did not increase significantly between 1982 and 1983.

我选的是A，为什么不对？