The circular-flow diagram is an example of ______.
A、a laboratory experiment
B、an economic model
C、a mathematical model
D、All of the above are correct.

3岁前儿童的思维主要是具体形象思维。（ ）

判断题3岁前儿童的思维主要是具体形象思维。（ ）

​和声织体在西方音乐史上哪个时期代替复调织体‍A．巴洛克时期 B．浪漫主义时期 C．文艺复兴时期 D．古典主义...

单项选择题​和声织体在西方音乐史上哪个时期代替复调织体‍

The specific methods for the translator to write a repo...

多项选择题The specific methods for the translator to write a report and review on a certain column are（ ）. A. adding eye-catching headlines to attracting readers’ attention B. adjusting the word order appropriately C. summarizing the key points of the full text D. replacing parts of the translation that readers may not understand