单选题：To explain the effect of trenches,the writer gives the examp

题目内容：

To explain the effect of trenches,the writer gives the example of A．the sea floor in the Atlantic Ocea
B．the Himalayan Mountain
C．Europ
D．lndi

参考答案：

答案解析：

The memory techniques used are no more complex than the old

The memory techniques used are no more complex than the old ____.

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