语篇解读：植物对环境有很多益处。研究者认为，女性若住在四处环绕植物的地方，死亡率会较低、可以减轻抑郁以及降低患癌症的风险；而且还发现植物寿命长短可影响女性的心理健康。

　　28．What's the author's purpose in writing the text?

　　A．To introduce the green environment and call on people to enjoy it.

　　B．To show women living in green areas are more likely to live long.

　　C．To show the relationship between animals and plants.

　　D．To give some tips on how to live long.

　　解析：选B　写作目的题。文章第一段引出话题，第二段提出本文的主题--女性若住在四处环绕植物的地方，死亡率会较低，下文对此话题展开说明，并详细介绍了该研究是如何进行的。由此可推断，作者写作本文的目的是说明生活在绿色植物较多的区域的女性可能寿命更长。故选B项。

　　29．How did the researchers make the research more convincing?

　　A．By studying more people.

　　B．By examining satellite images.

　　C．By taking more factors into account.

　　D．By cooperating with the Nurses' Health Study.

　　解析：选C　推理判断题。根据第五段第一句"To make it more believable, the researchers considered other risk factors - things such as the age of the women, their economic status, and race."可知，为了使研究更有说服力，研究者考虑了很多因素。故选C项。

　　30．When James found the connection between vegetation levels and death rates, he was ________.

　　A．excited　　　　　　　　 B．unconcerned

　　C．relieved D．surprised

　　解析：选D　细节理解题。根据第六段第一句"Peter James says he and his team were surprised to find such a strong link between high vegetation levels and low death rates."可知，当詹姆斯和他的团队发现高绿化率和低死亡率之间存在密切的联系时，他们很惊讶。故选D项。

　　31．What can we learn from the text?

　　A．People are unlikely to develop cancer because of living with green plants.

　　B．People die from cancer more than from other diseases.

　　C．Living with green plants can help lower depression.

D．This finding is specially made for city planners.