71. What is the main idea of this passage?

1. Stem cells can help restore vision in the eyes blinded by burns.
2. The vision in the eyes blinded by burns for 10 years can be restored.
3. The restored vision of the burned eyes treated with stem cells can last for 10 years.
4. The burned eyes can only be treated with stem cells from other healthy persons.

72. The Italian technique reported in this passage ____.

1. can repair damaged retinas
2. is able to treat damaged optic nerves
3. is especially effective for burn injuries in the eyes already treated surgically
4. shows a long-term effectiveness for blindness in vision caused by damage to cornea

73. Which of the following is NOT mentioned about eye burns?

1. The places in which people work.
2. The accidents that involved using household cleaning products.
3. The mishaps that involved vehicles batteries.
4. The disasters caused by battery explosion at home.

74. What is one of the requirements for the current approach?

1. The stem cells taken from a healthy eye.
2. The patient physically healthy.
3. The damaged eye with partial vision.
4. The blindness due to damaged optic nerves.

75. Which of the following words can best describe the author's attitude towards the new method?

1. Sarcastic.
2. Indifferent.
3. Critical.
4. Positive.

(Reference keys.)