单选题 The climax in the development of a sense of trust occurs ______.

A、 before maternal affection is provided
B、 when a child perceives that he or she is separate from the environment
C、 when a child successfully controls his or her muscular coordination
D、 as a result of maternal separation

【正确答案】 B

【答案解析】[解析] 本题的依据句是“It is at about this age that the struggle between trusting and mistrusting the world comes to a climax，for it is then that children first perceive clearly that they and their environment are things apart．”，从中可知B项为正确答案。