III. Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
____ national parks all over the world have been established to protect endangered animals.
A.Thousand
B.Thousands
C.Thousands of
D.Thousand of
____ national parks all over the world have been established to protect endangered animals.
A.Thousand
B.Thousands
C.Thousands of
D.Thousand of
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