投资利税率是( )。

A．使项目在计算期内各年净现金流量累计净现值等于零时的折现率
B．项目达到设计能力后的一个正常年份的年利润总额与项目总投资的比率
C．项目达到设计生产能力后的一个正常生产年份的利税总额或项目生产期内平均利税总额与项目总投资的比率
D．项目达到设计生产能力后的正常生产年份的利润总额或项目生产期内平均利润总额与资本金的比率

Air France SA said Monday that its second-quarter net profit fell 35 percent to €57 million ($57.4 million), but sales were steady and operating profit surged.Earnings before interest and tax, a measure of operating income, gained 86 percent to €141 million as fuel costs fell and cargo traffic rose. Air France has been hurt less than rivals such as British Airways PLC and Lufthansa AG by the slowdown on North Atlantic routes following the war on Iraq in 2003 because it has fewer flights in that market.Net income fell as the airline paid deferred taxes that came due. Sales rose 0.9 percent to €3.2 billion. The carrier lost about €80 million in revenue because of a four-day strike by pilots in September. An accord was reached tying future pay increases to inflation. The carrier said that first-half fuel costs fell 15 percent to €680 million. Cargo traffic rose 11 percent in the second quarter, while passenger traffic rose 1.1 percent. The airline’’s shares gained 87 cents, or 7.7 percent, to close at €12.11.Separately, Air France and Alitalia SpA agreed to buy 2 percent stakes in each other as Europe’’s second- and sixth-largest airlines deepen their partnership.

Which of the following is not a cause for Air France’s earnings to rise before interest and tax

A．The drop in fuel cost.

B．The rise in cargo traffic.

C．The rise in passenger traffic.

D．Its partnership with Alitalia SpA.