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Practice Reading: Multiple Choice, Single Answer
ID: #38107
Earth’s land
The deserts, which already occupy approximately a fourth of the Earth’s land surface, have in recent decades been increasing at an alarming pace. The expansion of desert like conditions into areas where they did not previously exist is called desertification. It has been estimated that an additional one-fourth of the Earth’s land surface is threatened by this process.
The word “ threatened ” in the passage is closest in meaning to
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