4.This study may contribute to 　. 

　　A.treating anxiety and stress better

　　B.explaining the cycle of fear and anxiety

　　C.finding the key to the heartbrain communication

　　D.understanding different fears in our hearts and heads

　　答案:A

　　解析:推理判断题。根据最后一段中的“...we may be able to develop more successful treatments for anxiety disorders,and also for those who may be suffering from serious stress disorder.(……我们或许能够更成功地治疗忧虑症,还可以治疗那些可能正遭受应激障碍疾病痛苦的患者。)”可推知,该研究有助于更好地治疗忧虑症和应激障碍。故选A项。

　　Ⅱ.完形填空

　　(2015云南师大附中适应性考试)

　　Visitors to the dry,hot Sonoran Desert of the southern Arizona and northern Mexico are amazed at the many-armed giants.They are the saguaro cacti(树形仙人掌),a giant which gives the landscape its　1　appearance.In the dry desert the saguaro cacti can live for more than 200 years,grow to a 　2　of 60 feet,and have as many as 50 arms. 

　　More 　3　,the saguaro cacti still persist despite the unbearable desert climate.Those that have grown to old age have　4　droughts,freezes,flash floods,and bush fires as well as the 　5　caused by groups of rats that eat their seedlings(秧苗).Like all other desert　6　,these leafless giants can store water for use during the desert’s long dry seasons by　7　 water through their long roots. 

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