求解释course在一个句子的意思和用法
“At present,many universities offer a variety of elective coursed and many college students prefer to have electives in their spare time.”（出自07年12月四级范文）中的coursed是动词过去分词作后置定语的用法吗?可是牛津双解字典里对course动词的解释只有一条：（literary）（of liquid 液体）to move or flow quickly.在这里明显解释不通么?