[填空题]After a sharp drop in 1999, profits recovered for twelve months and then fell again in 2001.

[填空题]After a sharp drop in 1999, profits recovered for twelve months and then fell again in 2001.

[填空题][*]
After a sharp drop in 2004，profits recovered for twelve months and then fell again in 2006．

[填空题]Profits started to increase steadily after a sharp drop in March.

[填空题]Just under a year ago, a sharp drop in equatorial Pacific sea-surface temperature indicated the end of the 1997~1998 E1 Nino. Called by someone "the climate event of the century", it was by several measures the strongest on record. (41)______.This is more than simply an academic question: the 1997~1998 E1 Nino severely disrupted global weather patterns and Pacific marine ecosystems, and by one estimate caused ＄033 billion in damage and cost 23,000 lives worldwide. (42)______.Clearly we have much to learn from this experience.
(43)______.Now E1 Nino more generally refers to a warming of the tropical Pacific basin that occurs roughly every three to seven years in association with a weakening of the trade winds. The opposite side of El Nino, La Nina, is characterized by stronger-than-normal trade winds and unusually cold sea-surface temperatures in the tropical Pacific. Both E1 Nino and La Nina are accompanied by swings in atmospheric pressure between the eastern and western Pacific.

[填空题]Some online businesses began to make profits after the technology-based Internet bubble economy ended.

[填空题]After a sharp fall in 2000, company profits recovered slightly the following year.

[填空题]After a sharp rise, there was no change in bicycle sales for the rest of the period.

[填空题]After a sharp increase in the sale in April, there was a small fall in May.