检索点
参考答案：
是指检索信息资源所使用的题名、责任者、分类号、主题词等各种供检索使用的数据。
According to this passage, which of the following best describes the three stages in Cezanne's painting style from the earliest to the latest
A．Romanticism, realism, impressionism.
B．Romanticism, impressionism, constructivism.
C．Romanticism, realism, constructivism.
D．Realism, romanticism, impressionism.
现在广泛应用的脊髓灰质炎疫苗是（）。
A.脊髓灰质炎灭活疫苗
B.亚单位疫苗
C.脊髓灰质炎减毒活疫苗
D.多肽疫苗
E.DNA疫苗
