61. Scientists have found that deep anesthesia ____.

1. is likely to affect hearing
2. cannot block surgeons' words
3. can cause serious damages to memory
4. helps retain conscious or subconscious memories

62. By the new study, the technique of bispectral analysis helps the scientists ____.

1. acquire an average measurement of brainwave changes over the whole surgery
2. decide whether the patient would retain conscious or subconscious memories
3. relate their measurements and recordings to the verbal sounds during surgery
4. assure the depth of anesthesia during surgery

63. To test the patients, the scientists ____.

1. prepared two lists of words
2. used ninety-six headphones for listening
3. conducted the whole experiment for three minutes
4. voiced only the first three letters of sixteen words during surgery

64. The results from the new study indicate that it was possible for the patients ____.

1. to regain consciousness under the knife.
2. to tell one word from another after surgery.
3. to recall what had been heard during surgery.
4. to overreact to deep anesthesia in the course of operations.

65. What we can infer from the finding?

1. How surgical malpractice can be prevented.
2. Why a surgeon cannot be too careful.
3. Why surgeons should hold their tongues during surgery.
4. How the postoperative patients can retain subconscious memories.

(Reference keys.)