5. A. did B. will C. would D. can
READING 6 – CLOZE TEST
Another side effect of the human population explosion will be the conversion of more land to food
production or cities. This habitat (1) ______ will cause progressive extinction of many more species.
Globally, 45 species of birds and 40
species of mammals went (2) ______ between 1650 and 1969, more have disappeared since then, and
many more are in endangered species list. It has been estimated that half of all the species on Earth
reside in the Amazon rain forest, (3) ______ most of them in Brazil. Brazil's plans to colonize and cut
down the rain forests and similar changes in Congo and Indonesia may very well (4) ______a major
episode of extinction. Recent efforts to estimate the projected rate of extinction suggest (5) ______
half of all the species of mammals and birds will become extinct within the next 200 to 300 years.
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