单选题 Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A, B, C and D.
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.
【正确答案】 A
【答案解析】
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.
【正确答案】 C
【答案解析】
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.
【正确答案】 D
【答案解析】