Passage 3Questions 11 to 15 are based on the following passage: Chokwe Selassie is on a mission to help drivers avoid potholes(路面坑洼). The Eight-grader was inspired to kick off his mission on a recent
Practice 2 (1) In order to communicate thoughts and feelings, there must be a conventional system of signs or symbols which mean the same to the sender and the receiver. The means of sending communic