In 1991，while t11e economies of industrialized countries met an economic_____，the economies of developing countries were growing very fast ．

Johnsaysthathispresentjobdoesnotprovidehimwithenough______forhisorganizingability.

设圆 C 与圆 (x-5) 2+y2=2 ，关于 y=2x 时称，则圆 C 方程为 ( )

It is estimated that ，currently, about 50，000 species become _____every year ．

In1991，whilet11eeconomiesofindustrializedcountriesmetaneconomic_____，theeconomiesofdevelopingcountriesweregrowingveryfast．