Câu hỏi: Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
The scientists are encountering the difficulties of _____ of radioactive waste.
A. depleting
B. preserving
C. eliminating
D. disposing
The scientists are encountering the difficulties of _____ of radioactive waste.
A. depleting
B. preserving
C. eliminating
D. disposing
Kiến thức về thành ngữ:
- on the tip of one's tongue: biết nhưng không thể nhớ ra
- on the tip of one's tongue: biết nhưng không thể nhớ ra
Đáp án B.