Thousands of species of animals and plants are _________ and the number decreases each year.
Đáp án D.
danger(n): mối nguy hiểm
dangerous(adj): nguy hiểm
endanger(v): gây nguy hiểm
endangered(v): nguy cơ tuyệt chủng
Dịch nghĩa: Hàng nghìn giống loài động thực vật đang có nguy cơ tuyệt chủng và số lượng
loài giảm mỗi năm.
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