23. D
- Đọc hiểu đoạn văn
24. C
- However, trash can end up floating on the ocean's surface or lying at the bottom of the sea making it extremely hard to remove. That's why [...]
25. D
- Over the past few months, the team and the robot have travelling across the United States and picking up trash in the ocean clean and healthy [...]
26. A
- Đọc hiểu doạn v ăn
27. C
- A. When people litter on the beach, trash can often be picked up after that by cleaners or volunteers
- B. That's why a team of scientists in San Francisco has been working on an ocean-cleaning robot
- D. As of now, the robot is only human-controlled and the team is hoping to develop a more advanced automatic robot in the near future.
