陕西礼泉县2016高考英语阅读理解（二轮）联练（3）
【2014高考英语湖北省襄阳市统考试题】
A single tumor（肿瘤）can be made up of many separate cancers needing different treatments, say researchers．
A team at the Institute of Cancer Research, London, has developed a new technique for measuring the diversity within a cancer． They showed \differences between cancerous cells and say traditional drugs may fail as they may be unable to kill all the mutated （突变）tissue．Experts said the f'mdings would have \．
A tumor starts as a single cell, which acquires mutations and eventually divides uncontrollably．But that is not the end of the process． Cancerous cells continue to mutate and become more aggressive, move round the body and resist drugs． This process is disordered and results in a \that have mutated in different ways．
\the BBC． His team at the Institute of Cancer Research investigated cancer diversity in five children with leukemia．They compared mutations in individual cancerous cells with a known database of mutations．Their results, published in the journal Genome Research, showed patients had between 2 and 10 genetically distinct leukemia．Prof Greaves said:\patient doesn't have one cancer, they have multiple cancers． This is really a technical advance to get at this extraordinary complex diversity; it helps explain why we have such difficulty with advanced diseases．\
Scientists compare cancer diversity to a tree． The initial mutations the trunk will be common to all cancer cells． But then the tumor branches out． It means a treatment that targets one \or sub-clone of the cancer might slow the disease, but they will never stop it． Prof Charles Swanton, who researches diversity at the University College London Cancer Institute, told the BBC:\（修剪） the branches not cutting down the tree; treatment will remove some of the sub-clones, but cutting down the tree is hard to do． The bottom line is that we need to understand cancer diversity to limit further adaptations, reduce the pace of evolution and prolong the activity of drugs．\
67． Why do the traditional drugs have no effects on treatment of cancer？ A． They are worsening the condition．
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B． They are unable to kill the constantly changing cancerous cells． C． It takes a long time for them to have effects． D． They are not powerful enough．
68． From paragraph 3, we can know that ． A． mutation takes place in body in order B． the process of mutation comes to an end soon C． the mutations are out of control eventuaily D． cancerous cells mutate in the same way
69． Scientists compare cancer diversity to a tree because ． A． cancers develop quickly just like a tree
B． treating cancers is as difficult as cutting down a tree C． tumor needs nutrition when mutating
D． new tumor will come out during the mutating process 70． The passage mainly talks about ．
A． the tumor is constantly mutating in different ways B． cancer is impossible to treat C． a new drug for cancer will be on sale D． why cancers resist drugs 【参考答案】67-70：BCDA
【2014高考英语湖北省武昌区调研试题】A
阅读下列短文，从每篇短文后所给各题的四个选叭A、B、c和 D）中，选出最佳选项，并在答题卡上将该项涂黑。
At a recent visit to the beautiful Keukenhof flower gardens in Holland, I learned
about the practice of topping．As flowers grow, sometimes the growers cut off the tops of the flowers, which they believe causes the plants to invest more energy into flower growth and less into seed production．The expected result is flower buds that will produce higher quality flowers．
This is the same with personal growth．Sometimes when we produce first results in a certain area, it can be helpful to cut them off and throw them away．This can
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