“忧者见之而忧，喜者见之而喜”这是（ ）的表现。

(单选题)Jean Wagner’s most enduring contribution to the study of Afr (单选题)Some insects’ wings vibrate so fast ______ the movement is i (单选题)—Who are making so much noise in the street?—______the child (单选题)Those who are not admitted to university, ______, may attend (单选题)As the road to the airport is under reconstruction, we’d bet (单选题)Due to the heavy damage the storm has caused in some rural a (单选题)The changes made in the working conditions at our company re (单选题)—Will 1,000 ______ the cost of the trip?—I’m afraid not. Per (单选题)To tell you the truth, I really find ______ unbearable to wo (单选题)He doesn’t like driving ______ car while going to work since