There are four basic skills in English learning — listening speaking reading and writing

问题补充：

There are four basic skills in English learning — listening, speaking, reading and writing. Ms. Li suggests that students should spend 2.5 hours improving the four basic skills after class every week. According to Ms. Li’s form, Charles has spent minutes in all (总计) practicing writing during the past three weeks.

A. 1.5 B. 30 C. 90

答案：

解析：根据表格计算可知用于写作的百分比占1-30%-15%-35%=20%。每周用2.5小时进行课后练习，则三周用与写作的占2.5*3*20%=1.5小时。1.5*60=90分钟，选C。