2019年12月英语四级真题与答案解析（第一套） _第3页

　　卷一46-50:AI助手

　　46: B It is a course designed for students to learn online.

　　47: C Students'questions were unsatisfied weith the assistants 48: A She turned out to be a great success

　　49: D They could not tell her from a real person

　　50: C Assign her to answer more of students'questions

　　51-55:科学筹款

　　51: C Not all of them achieved their anticipated goals

　　52: B To identify reasons for their different outcomes

　　53: B Its interaction with prospective donors

　　54: A They should be small to be successful

　　55: D Thcir fccling of conncction to the scientists themselves