[ Vocabulary ]
More than a billion people all over the world are under the threat of desert .
A. ncrease
B. expansion
C. development
D. extension
Select your answer:
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Vocabulary › ViewChoose the best synonym for the underlined word:
saw the jagged cliffs
A. distant
B. rugged
C. smooth
D. steep
Adverbs › View
The astronaut easily fixed the problem.
A. fixed
B. problem
C. easily
D. the