At ______, photography is a chemical process, during which a light-sensitive material is altered when exposed to light.
A. its most basic
B. its basic
C. the most basic
D. the basic
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在联机编目与网络化的环境下,规范工作是书目信息资源持续发展与共建共享的关键()
网络信息检索策略制定遵循四个原则,一是快、二是准、三是全、四是效益原则()
U.S. News ____________ rankings of colleges since 1983. They are a very popular resource for students looking to apply to university campus.
A. maintains
B. is maintaining
C. maintained
D. has been maintaining