18. The two factors responsible for 'opening the door' and 'keeping this door open' to a museum visitor (paragraph 4) are, respectively:
A) pressur...
18. The two factors responsible for 'opening the door' and 'keeping this door open' to a museum visitor (paragraph 4) are, respectively: A) pressure of tests and grades / a museum's tense atmosphere. B) the rational reaction of the visitor / a museum's threatening atmosphere. C) the emotional reaction of the visitor / the museum's non-threatening atmosphere. D) the negative reaction of the visitor / a museum's tense atmosphere. E) a museum's tense atmosphere / pressure of tests and grades.
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