(Paragraph 1)Around the US, educators say students in class routinely send messages, listen to music and shop online. There are also countless other examples of how smartphones disturb teaching and learning. “Students used to have an understanding that they weren’t supposed to be on their phone in class. Those days are gone,” said James Granger, a high school teacher.

Q: What can we learn from paragraph 1?

The functions of smartphones are increasing.

Most of the Americans choose to shop online.

Listening to music is good for students’ mental health.

More and more US students are using phones in class.

推理判断题。根据第一段“Around the US, educators say students in class routinely send messages, listen to music and shop online. There are also countless other examples of how smartphones disturb teaching and learning. “Students used to have an understanding that they weren't supposed to be on their phone in class. Those days are gone,” said James Granger, a high school teacher.(在美国各地，教育工作者表示，学生们在课堂上经常发信息、听音乐和网上购物。智能手机干扰教学的例子也数不胜数。“学生们过去认为，他们不应该在课堂上玩手机。那些日子已经一去不复返了，”高中教师詹姆斯·格兰杰（James Granger）说。)”可推断，在美国，越来越多的学生在课堂上玩手机。故选D。