河北省定州中学2016-2017学年高二下学期周练（1）英语试题

河北定州中学2016-2017学年第二学期高二英语周练试题(1) 一、阅读理解 1.Would it surprise you to learn that, like animals, trees communicate with each other and pass on their wealth to the next generation? UBC Professor Simard explains how trees are much more complex than most of us ever imagined. Although Charles Darwin thought that trees are competing for survival of the fittest, Simard shows just how wrong he was. In fact, the opposite is true: trees survive through their co-operation and support, passing around necessary nutrition “depending on who needs it”. Nitrogen(氮) and carbon are shared through miles of underground fungi(真菌)networks, making sure that all trees in the forest ecological system give and receive just the right amount to keep them all healthy. This hidden system works in a very similar way to the networks of neurons(神经元)in our brains, and when one tree is destroyed, it affects all. Simard talks about “mother trees”, usually the largest and oldest plants on which all other trees depend. She exp