The tropical rain forest belt extending around our planet at the equator (赤道) has taken some 60 million years to evolve to its present state. It is, quite simply, the most complex and the most important ecosystem (生态系统) (47)________ earth.
Homo Faber, Man the Builder, has tragically always seen the jungle (48)________ an enemy, an environmerit (49)________, replaced with his own constructions. In the (50)________ twenty years the rate of destruction has increased alarmingly (51)________ huge areas of green, beautiful forest — an irreplaceable treasure house of living things—has given (52)________ to wasteland. The evidence is that man will redouble (53)________ destructive efforts until the forest system is smashed, and the jungle will (54)________ no more.
Many experts predict the tropical rain forests will finally (55)________ around the end of our (56)________. Well done, 20th century.
WORD BANK
A. or B. vanish C. century D. his
E. use F. as G. defeated H. verify
I. function J. way K. their L. on
M. and N. in O. past