四川2019高考英语一轮题型整合练（5）李仕才一、阅读理解。A(2018广西重点高中模拟)People love cellphones, which is why nine in ten Americans own one.But does heavy use of cellphones pose a risk of cancer? This question has caused controversy for many years. A new study in rats now augments those concerns.Its data linked longterm, intense exposure to radiation from cellphones with an increased risk of cancer in the heart or brain.The results have yet to be confirmed, the authors note.Indeed, although the rat study found a link between cellphone radiation and cancer, it offers no clues to why such a link might exist, notes Jonathan Samet.He teaches preventative medicine and directs the Institute for Global Health at the University of Southern California in Los Angeles.Still, he calls the new studys findings “significant”They could lead to studies researching how cellphone radiation might cause cancer, he says.Phone signals are relayed between cell towers and cellphones via radio waves.This radio frequencyor RFradiation is a type known as nonionizing(非电离的). Unlike Xrays, nonionizing radiation does not deposit enough energy into cells to release electrons from atoms or molecules, producing ions.So it tends to be far less harmful than ionizing radiation, such as Xrays.But that does not mean radio waves might not cause harm.In very large doses(量) this radiation will heat the body and cause tissue damage.But its not yet known what much lower RF levels might do, such as those from cellphone use.Five years ago, the World Health Organizations International Agency for Research on Cancer, or IARC, concluded that cellphone use “is possibly carcinogenic(致癌的)”Its conclusion was based on what little research data was available at that time.But notice that IARC was not certain.It said only that phone use might “possibly” cause cancer.So scientists at the National Toxicology Program, or NTP, investigated further.【解题导语】本文是一篇说明文。人们喜欢用手机，90%的美国人都有手机。那么，过度使用手机是否会有患癌的风险呢？一项新的研究给出了一些线索。1Which of the following can replace the underlined word “augments”？Afigures outBputs outCrefers toDadds toD解析：词义猜测题。画线词前面提到过度使用手机是否有患癌的风险这一问题多年来引发的争议不断，再根据画线词后的“concerns”和“Its data linked longterm, intense exposure to radiation from cellphones with an increased risk of cancer in the heart or brain.”可知，现在一项在老鼠身上进行的新研究增加了那些忧虑。故画线词与adds to意义相近。2In which aspect does Jonathan Samet think the new study in rats is significant?AIt assists him with his teaching.BIt indicates a new research direction.CIt warns people to mind cellphone safety.DIt makes a breakthrough in cancer research.B解析：推理判断题。根据第二段最后一句可知，这项研究会促使科学家去查明手机辐射可能是怎样致癌的，也就是说它为科学家提供了一个新的研究方向。3What is Paragraph 3 mainly about?AHow phone signals are delivered.BHow cellphones produce radiation.CFeatures of radiation from cellphones.DDifferences between ionizing and nonionizing radiation.C解析：段落大意题。根据第三段的“nonionizing radiation does not deposit enough energy into cells to release electrons from atoms or molecules, producing ions.So it tends to be far less harmful than ionizing radiation.”可知，本段主要讲的是手机辐射的特点，它是非电离的，其危害性远低于电离辐射。4What might be the theme of NTP scientists further research?AWhy cellphone use causes cancer.BWhether cellphone use really causes cancer.CWhat health effects cellphone use has.DHow much exposure to cellphone radiation is safe.B解析：推理判断题。根据最后一段中的“It said only that phone use might possibly cause cancer.So scientists at the National Toxicology Program, or NTP, investigated further.”可知，NTP的科学家进一步研究的主题可能是手机使用是否真的会导致癌症。BGrey clouds move as low as smoke over the treetops at Lolo Pass. The ground is white. The day is June 10.It has been snowing for the past four days in the Bitterroot Mountains. Wayne Fairchild is getting worried about our trek over the Lolo Trail-95 miles from Lolo Montana to Weippe in Idaho, across the roughest country in the West. Lewis and Clark were nearly defeated 200 years ago by snowstorms on the Lolo. Today Fairchild is nervously checking the weather reports. He has agreed to take me across the toughest, middle section of the trail.When Lewis climbed on top of Lemhi Pass,140 miles south of Missoula, on Aug.12,1805,he was astonished by what was in front of him; high mountain chains still to the West of us with their tops partially covered with snow. Nobody in what was then the US knew the Rocky Mountains existed, with peaks twice as high as anything in the Appalachians back East.Today their pathway through those mountains holds more attraction than any other ground over which they traveled, for its raw wilderness is an evidence to the character of two cultures: the explorers who braved its hardships and the Native Americans who prize and conserve the path as a sacred (神圣的)gift. It remains today the same condition as when Lewis and Clark walked it.The Lolo is passable only from July to mid-September. Our luck is holding with the weather, although the snow keeps getting deeper. As