1. How does the author respond when the researcher asks him if his experience with the drug is positive or negative?
(a) It is mostly negative, but the positive parts make it worthwhile.
(b) It is mostly positive, but frightening at times.
(c) It is neither positive nor negative; it just is.
(d) It is positive for him, but he can see where it would be frightening for others.

2. According to the author, why do religious devotees participate in practices to atone for their sins?
(a) To get a reprieve from feelings of guilt or inadequacy.
(b) To achieve a better understanding of themselves and the teachings of their religion.
(c) To prepare themselves for judgment after death.
(d) To achieve a natural high, created by feelings of religious exultation.

3. How does the author respond when asked about spatial relationships?
(a) They have completely ceased to matter to him.
(b) They are warped and inaccurate.
(c) They don't seem to matter as much as they usually do.
(d) They are more noticeable and pronounced than usual.

4. In what type of plant is the substance being tested commonly found?
(a) A bush.
(b) A cactus.
(c) A flower.
(d) A tree.

5. What is the main reason for conducting the experiment in which the author participates?
(a) A need to understand the so-called "visionary" experiences associated with the drug.
(b) A need to catalogue the psychological effects of the drug on someone who already has a psychiatric illness.
(c) A need for more comprehensive information regarding the drug's long-term side effects.
(d) A need to understand why the drug has been used in religious and secular ceremonies.