单选题
- A. Its protection is often neglected by children.
- C. There are many false notions about it.
- B. It cannot be fully restored once damaged.
- D. There are various ways to protect it.
单选题
- A. It may make the wearer feel tired.
- B. It will gradually weaken the eyes of adults.
- C. It can lead to the loss of vision in children.
- D. It can permanently change the eye structure.
单选题
- A. It can never be done even with high technology.
- B. It is the best way to restore damaged eyesight.
- C. It is a major achievement in eye surgery.
- D. It can only be partly accomplished now.