发布时间 : 星期一 文章浙江省杭州市萧山区2016届高三高考命题比赛英语试卷21 Word版含答案 doc更新完毕开始阅读
most affordable fares and also avoid paying as many extra charges as possible when you plan ahead.
Getting the best fare. Airlines put out their fare sales on Tuesday morning, making this day the best day to book a flight for less.
Fly during the least popular times. Tuesday, Wednesday and Saturday are the slowest days to fly, which means cheaper deals than the rest of the week. You can also find reduced rates on early morning flights, since many people don‘t like to get up before the sun to get to the airport. Earlier boarding times can also considerably cut down your chances of getting bumped on an overbooked flight or delayed because of other delayed flights or mechanical issues.
Choose your seat later. Some airlines charge you to pick your seat when you book online, adding even more to the bottom line of your ticket cost. If you show up early on your travel day, you can still get suitable seats. Some of the best seats get held back until flight day, unless others are willing to pay extra for them ahead of time, so you still have the chance at one of those.
Fly on holidays. You already know that summer is the most expensive time to fly, and even though most other times are more affordable, the days surrounding holidays can be crazy. Save big if you‘re willing to travel on major holidays, such as Thanksgiving and Christmas.
Don‘t wait until the last-minute to book. Many travelers don‘t know that there‘s a sweet spot for booking and getting the best price on your tickets. Book too early or too late and you could end up paying more than you need to. The best time to book is between three months and six weeks from when you want to travel.
Avoiding extra fees Airlines will charge for just about anything these days. Some have even toyed around with charging customers for using the restroom. All those extra fees can certainly add up, but there‘s no reason to pay them if you don‘t have to. Here are some tips to keep money in your wallet once you get to the airport.
Avoid the upgrade it's not necessary. Sometimes upgrades are free, but mostly you will be charged for seeking a last-minute bump to first class, and the cost can be hefty.
Fly carry-on only. Baggage fees vary wildly, but almost all airlines charge them and charge big. Why pay for your clothes to fly with you? If everyone in your travel party checks a bag, your bill can be astronomical before you ever even get to your destination. It‘s easy to reduce the amount of stuff you pack: Make sure all your clothing coordinates, so you can take less and still
make more outfit combinations, take only two pair of shoes, plan to do a bit of laundry on your trip and bring only travel-sized toiletries.
Pack your own snacks. Unless you‘re flying internationally, it‘s rare your flight comes with a free meal. Snacks on the plane are not cheap and almost never healthy. Don‘t rely on what‘s on the small menu and instead tuck some of your own snacks – granola bars, homemade muffins, fruit and trail mix all make fantastic travel foods – into your bag and eat a lot better, and cheaper, than other passengers.
Do you have a tried and true method of getting the best deal on your flights? Let us know. 46. Tuesday is the best to book a ticket at a lower cost for __________. A. fewer people travel on Tuesday. B. the flights are slower than usual.
C. fare sales are usually announced on Tuesday. D. flights are seldom delayed on Tuesday.
47. Which of the following will help to cost you less for a flight? A. Book your flight on Thursday. B. Travel surrounding Christmas.
C. Pick your seat the moment you book online D. Book early morning flights
48. If you plan to travel on Thanksgiving, you‘d better book your flight in ________. A. May B. December C. September D. November 49. To save the cost for the flight, you should __________.
A. check whether the upgrade is free before you bump to the first class. B. make sure your clothes and shoes are fit for a lot of walk. C. share your own snacks with other passengers. D. plan to do the washes on flight.
C
Exercise is strongly associated with lowered risks for many types of cancer. At the same time,
exercise involves biological stress, which typically leads to a short-term increase in inflammation throughout the body. Inflammation can contribute to increased risks for many cancers. Now, a new study in mice may offer some clues into the exercise-cancer puzzle.
To try to better understand how exercise can both elevate inflammation and simultaneously protect the body against cancer, scientists at the University of Copenhagen in Denmark and other institutions decided to closely examine what happens inside mice at high risk for the disease. So, for the new study, they began by gathering a group of adult lab mice. These animals generally like to run. The scientists then implanted melanoma skin cancer cells into the mice before providing half of them with running wheels in their cages while the other animals remained sedentary. After four weeks, far fewer of the runners had developed full-blown melanoma than the sedentary mice and those that had been diagnosed with the disease showed fewer and smaller damages.
Next, the scientists undertook the far more challenging task. To start, they drew blood from both the exercising and sedentary animals and cells from any tumors(肿瘤) in both groups. Then they looked at how the various samples were different.
As expected, they found much higher levels of the hormone adrenaline (肾上腺素)in the blood of the exercising animals, especially right after they had been working out on the wheels but also at other times of the day.
They also found higher levels of interleukin-6 in the blood of the runners，a substance released by working muscles and believed to both increase and decrease inflammation in the body conditionally, depending on where and how it goes to work.
Perhaps most important, they found much higher numbers in the bloodstreams of runners than in the sedentary mice of a type of immune cell named natural killer cells that are known to be effective cancer fighters.
Somehow, the scientists speculated, these elements in the runners — their elevated adrenaline, IL-6, and natural killer immune cells and their lower cancer risk — must be connected in a complicated way, but it wasn‘t clear how.
So the scientists repeated their original experiment multiple times. But in some of these follow-up experiments, they injected the runners with a substance that blocked the production of adrenaline and gave sedentary animals large doses of added adrenaline.
What they now saw was that when running mice could not produce adrenaline, they developed cancer at the same rate as the sedentary animals, while the sedentary animals that had been injected with extra adrenaline fought off their tumors better than other sitting mice.
With these results, ―we show that voluntary wheel running in mice can reduce the growth of tumors, and we have identified an exercise-dependent mobilization of natural killer cells as the underlying cause of this protection,‖ said Pernille Hojman, a researcher at the University of Copenhagen who oversaw the new study.
But mice, obviously, are not people, and it is impossible to know from this study whether a similar process occurs in humans, although exercise, such as jogging, has been shown to increase adrenaline and the production of natural killer immune cells in people, Dr. Hojman said.
―So the mechanisms,‖ she said, that seemed to partially protect the running mice in this study from tumor. ― can also happen in people,‖ perhaps providing one more motivation, if we still need it, to get up and move.
50. The scientists at the University of Copenhagen in Denmark did the research to find the relationship between _________.
A. mice and human B. exercise and cancer C. exercise and inflammation D. cancer and inflammation
51. When conducting the research, the scientists provided _________with running wheels.
A. all the mice implanted cancer cells B. all the mice without cancer cells C. half the mice implanted cancer cells D. half the mice without cancer cells
52. The underlined word ―sedentary‖ in paragraph4 most probably mean _________
A. spending a lot of time sitting B. doing a lot of running C. eating more than others D. climbing quickly up and down
53.According to the new study, which contributed most to reducing the growth of tumors in the