单选题 The object for each player in the game of chess is to trap the other player's king into a position from which escape is impossible.

【正确答案】 B
【答案解析】skill技巧；aim目标；interest兴趣；difficulty困难。尽管。object的主导词义是“物体”，但在此句中意为“目标”，故选B项。