单项选择题
His pleasant personality is derived from his good humor and understanding.（）
A．由于他性情好又富于同情心，所以他招人喜爱。 B．他性格好，这是因为他心情好并且通情达理的缘故。 C．他良好的个性源自于他良好的性情和理解力。 D．他心情愉快，通情达理，所以性格开朗。
单项选择题 I always locked up my letters to keep my noisy roommate from prying into them.（）
单项选择题 We learn from the first paragraph that（）
单项选择题 According to the passage, we cannot work all the time without（）
