考查事实细节。根据关键词psychologist 可以定位到文中第三段Psychologists tell us boundaries are healthy, that it's important to reveal yourself to friends, family and lovers in stages, at appropriate times.心理学家告诉我们人与人之间保持界限是有益健康的，将自己一步步地展现给自己的朋友，家人和爱人是很重要的，由此可知朋友之间保持距离是有必要的。03.Why does the author say "we live in a world where you simply cannot keep a secret" (Para. 3)?
AModern society has finally evolved into an open society.
BPeople leave traces around when using modern technology.
CThere are always people who are curious about others' affairs.
DMany search engines profit by revealing people's identities.