单项选择题

Questions 11 to 13 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions.
Now, listen to the passage.
Children needed to learn arithmetic when ______.

A．the society became more complex
B．money was created
C．trade appeared
D．schools became necessary

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单项选择题

单项选择题

Questions 11 to 13 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now, listen to the passage. Children needed to learn arithmetic when ______. 您的浏览器不支持 audio 元素。