下列关于信息的描述，正确的是（）

A.search，collect，organize and interpret health and biomedical information from different databases and sources.
B.retrieve patient-specific information from a clinical data system.
C.use information and communication technology to assist in diagnostic，therapeutic and preventive measures，and for surveillance and monitoring health status.
D.understand the application and limitations of information technology.

A.determine the nature and extent of the information needed and access needed information effectively and efficiently.
B.evaluate information and its sources critically and incorporate selected information into his or her knowledge base and value system.
C.use information effectively to accomplish a specific purpose individually or as a member of a group.
D.understand many of the economic，legal，and social issues surrounding the use of information and access and use information ethically and legally.

A.增加用AND连接的检索词。
B.减少用OR连接的检索词。
C.选用下位主题词检索。
D.在原用副主题词的基础上，增加其它副主题词来检索。