exercises, practice
exercise运动,锻炼(不可数),exercises练习(可数),practice(反复做的)练习 Practice makes perfect.
5.class,
lesson
作“课”解时,两者可以替换.指课文用lesson.指班级或全体学生用class.
lesson 6; class 5
6.speech,
talk, lecture
speech指在公共场所所做的经过准备的较正式的演说,talk 日常生活中的一般的谈话,讲话,lecture学术性的演讲,讲课 a series of lecture on„
7.officer,
official
officer部队的军官,official政府官员 an army officer
8.work,
job
二者均指工作。work不可数,job可数 a good job
9.couple,
pair
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