中学英语单词用法总结学习精编touch和tour和toward等 touch  [tʌtʃ] v.接触；触及 ‖ n. [C, U]接触；触及                         Don't touch the door; the paint is wet.别碰这门，油漆未干。 Now that we've met again after all these years，let's keep in touch with each other.既然这么多年之后，我们又相见了，咱们以后保持联系吧。[ keep in touch with与••…保持联络] 短语：1.touch off 触发： e.g. Some slight incident may touch off a major war. 有些小事可触发大事。       2.be in touch with 接触，取得联络： e.g. I am always in touch with her.我与好她一直保持联络。 背单词的好方法 随时随地背单词 不知不觉背单词 单词不用记 tour  [tʊə] n.[C ]旅游；观光，参观 The tour included a visit to the Science Museum.这次游览包括参观科学博物馆。           短语：1.tour in sth 在某地旅行       2. be on a tour to SW  去某地观光旅游 tourist  ['tʊərɪst] n.[C]旅游者；渡假者，观光者 London is full of tourists in the summer.夏季伦教有很多游客。 toward(s)  [tə'wɔːd; twɔːd; tɔːd] prep朝向；朝着      eg: The child came running towards me. 那孩子向我跑来。 Directions: Fill in each blank with a proper word chosen from the box. Each word can be used only once. Note that there is one word more than you need.  A. potentially B. results C. rewards D. sensitive E. survival F. transmit G. distinguish H. responding I. developed J. conscious K. rapidly Sense of smell is our most rapid warning system “The human avoidance response to unpleasant smells associated with danger has long been seen as a 31_____ perceivable process, but our study shows for the first time that it’s unconscious and extremely rapid,” says the study’s first author Behzad Iravani, researcher at the Department of Clinical Neuroscience, Karolinska Institutet.  The organ relating to the sense of smell takes up about five per cent of the human brain and enables us to 32 _______ between many million different smells. A large proportion of these smells are associated with a threat to our health and 33________, such as that of chemicals and rotten food. Smell signals reach the brain within 100 to 150 milliseconds after being breathed in through the nose.  The survival of all living organisms depends on their ability to avoid danger and seek 34______. In humans, the smell sense seems particularly important for detecting and reacting to 35_________ harmful substance.  It has long been a mystery just which sensory systems are involved in the change of an unpleasant smell into avoidance behavior in humans. Researchers at Karolinska Institutet have now 36 ________ a method that for the first time has made it possible to measure signals from the human smell organ, which processes smells and in turn can 37________ signals to parts of the brain that control movement and avoidance behavior.  Their 38_________ are based on three experiments in which participants were asked to rate their experience of six different smells, some positive, some negative, while the electrophysiological activity of the smell organ when 39______ to each of the smells was measured.       “It was clear that the organ reacts specifically and 40________ to negative smells and sends a direct signal to the outer layer of the organ within about 300 ms,” says the study’s last author Johan Lundström. ” The signal causes the person to unconsciously lean back and away from the source of the smell. ”