Test analysis: A. Accident B. Coincidence C. Event? D. opportunities; It is no coincidence that four jewelry stores were robbed at the same time in one night, so B was chosen.

Comments: Word sense discrimination tests students' basic knowledge of vocabulary. Understanding the meaning of each option is the key to doing this kind of problem well. For this kind of problem, we can start with clauses. At the same time, we should also accumulate more vocabulary for our usual study, so as to complete the exam well.