听力首页 听力教程 VOA慢速 英语歌曲 外语下载 英语小说 英语词典 在线背单词 听力论坛 韩语学习
听力专题 英语教材 VOA标准 英语动画 英语考试 资源技巧 英语翻译 单词连连看 听力家园 德语学习
听力搜索 英语导读 BBC英语 英语视频 英语电台 英语QQ群 外语歌曲   英语游戏 英语网刊 日语学习
当前位置: 英语听力论坛 » 【六级教室】 » 六级练习2012.03.28
返回列表 发帖

六级练习2012.03.28


       
       




5 weekly aerobic sessions of about 20 minutes each seemed to produce the best results. Those who (1)_________________________. Nieman says the explanation comes from what happens to certain white blood cells when the body kicks into exercise mode: (2)_________________________, looking for invaders, such as the viruses that cause colds and other respiratory infections.
"Most immunologists interpret this as what they call improved immunosurveillance, or the ability of the immune system to detect and then engage pathogens and destroy them."
The so-called common cold is one of the most frequent illnesses in many parts of the world. According to one study, the economic burden is (3)_________________________. David Nieman's study is reported in the British Journal of Sports Medicine.




本帖隐藏的内容需要回复才可以浏览

返回列表