题目内容

Primary sources report a discovery, share new information, orpresent original thinking.

A. 对
B. 错

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Maps are ______.

A. primary sources
B. secondary sources
C. tertiary sources

textbooks are _______.

A. primary sources
B. secondary sources
C. tertiary sources

Papers in a journal are ______.

A. primary sources
B. secondary sources
C. tertiary sources

Indexes are _______.

A. primary sources
B. secondary sources
C. tertiary sources