单项选择题

根据发生过程的不同硬骨又分为两种类型：软骨化骨和膜骨。
A、正确
B、错误

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单项选择题

One of the most important moves in the conclusion section of a review article is to point out:

A． the gaps in the present research area and future research work
B． the method of conducting this review
C． what the author’s conclusion about what he has reviewed
D． what others have done in the given research area

多项选择题

在封建社会，臣下对皇帝可称呼?
A、皇帝
B、寡人
C、陛下
D、皇上