2．开头已为你写好，不计入总词数。

　　I’d like to air my views about it.

　　阅读表达Why do IQ scores vary by nation? / Why do IQ scores vary from nation to nation? / Different IQ between nations may result from infectious diseases.

　　【解析】总结全文内容可得答案。

　　2．【答案】highest disease burdens

　　【解析】根据文中The countries with the lowest average IQ scores have the highest disease burdens without exception.可知答案。

　　3．【答案】in several ways

　　【解析】根据后文内容They can directly attack。。。；They can invade the digestive pipe。。。；They can rob the body's cells for their own。。。；总结可得答案。

　　4．【答案】Education, income and non-agricultural labor.

　　【解析】根据文中Many causes have been put forward for both the intelligence difference and the Flynn effect, including education, income, and even non-agricultural labor.总结可得答案。

　　5．【答案】National disease burdens and average intelligence scores.

　　【解析】根据Using data on national "disease burdens" (life years lost due to infectious diseases) and average intelligence scores, the authors found they are closely associated. 总结可得答案。

　　第节：书面表达I’d like to air my views about it.

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