How can David find the most important information to write down?

A．By remembering all the details of the lecture．

B．By reading the notes taken by his classmates．

C．By focusing on the organization of the lecture．

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1 How many suggestions has Professor Smith given to David?

A．Two．

B．Three．

C．Four．

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2 听第10段材料，回答题。
Who brought silk to Europe in the thirteenth century?

A．Napoleon．

B．Marco Polo．

C．Leonardo da Vinci．

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3 What do we know about silk today?

A．It is very popular among painters．

B．It is much cheaper than in the past．

C．It is used by famous dress designers．

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