Câu hỏi: Deforestation is one of the biggest environmental threats to the ecological balance in the world.
A. sureties
b. certainties
c. dangers
d. safety
Đáp án:C
Threat = danger (mối nguy hại)
Bài 2. Mark the letter A, B, C, or D to indicate the underlined part that needs correction in each of the following questions.
