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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参考答案

B。本题出题点在时间状语从句处(when)短文提到，当钱被发明出来后，他们需要学会数数和计算，故本题选B。

1 听录音，回答以下问题：
Which of the following statements is TRUE about the speaker?

A．He has always lived in America．

B．He has been in America for three years．

C．He visited America three years ago．

D．He has come to America to do research on advertising．

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2 When he first arrived in America, the speaker found the advertisements there______．

A．were more than he had expected

B．were well designed

C．were creative and necessary

D．were difficult to understand

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3 To buy better products, the speaker must______．

A．read more advertisements

B．ignore advertisements

C．be clear of advertising techniques

D．be careful about those being advertised

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