问题：
[单选题]地理信息系统科学体系分为三个层次：理论地理信息科学、技术地理信息科学和（ ）
A、应用地理信息科学
B、空间地理信息科学
C、虚拟地理信息科学
D、基础地理信息科学
参考答案：
A
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