【正确答案】 A

【答案解析】[解析] 画线词cheerful为形容词，意为“快乐的，愉快的，高兴的”。A项pleasant意为“令人愉快的，舒适的”；例：They often remember the pleasant days they had with you.他们时常想起与你共度的愉快时光。B项colorful意为“华丽的，富有色彩的”；例：The bird is with colorful feathers.这只乌长着五颜六色的羽毛。C项fashionable意为“流行的，时髦的”；例：It was fashionable in the past that women were laced in.在过去，妇女束腰很时髦。D项different意为“不同的，个别的”；例：Every individual learns differently.每个人的学习方式都不一样。故选A。