It can be concluded that science education has reached a new phase of develop...

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问题 It can be concluded that science education has reached a new phase of development.

选项 A:grade
B:class
C:standard
D:stage

答案D

解析本句意思：可以概括地说，科学教育已经发展到了一个新阶段。phase阶段，时期。stage 时期，阶段，程度；grade等级；clas。阶级；standard标准。

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