1. The world's rain forests are being cut down at the rate on 3,000 acres per hour.
A B C D
2. Many scientists fear that the earth will run out essential natural resources before the end of the 20
century.
A B C D
3. Because much species of plants and animals in Hawaii are threatened with extinction within a short period
A B C
of time, scientists are trying desperately to rescue them.
D
4. Her many friends, among who I like to be considered, gave her encouragement.
A B C D
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Sinh Học lớp 12
