单选题 To keep with the new developments in this field he ______ to a number of journals concerned with it.

【正确答案】 A

【答案解析】subscribe to订阅；prescribe开处方，规定；subsidize资助，给津贴；substitute代替。句意：为了了解这一领域的新发展，他订阅了一系列有关的杂志。