Unit 4 Problems and advice
1. online adj. 在线的；在网上 adv. 在线；在网上
This online article is very interesting. 这篇在线文章很有趣。
2. model n. 模特儿
Sally is going to be a model because she thinks she is good-looking.
Sally自以为相貌出众，所以想当模特。
提示：model还有以下的含义：
a. (依照实物按比例制成的）模型。 a model plane
b. 样式；设计；型。 The latest model will be on display at the car show.
c. 模范；典型 a model student
