【文章內(nèi)容簡(jiǎn)介】 nufacturing, may not have the option at all. Policies with respect to data flows and taxation would need to be adjusted should the volume of crossborder digital services rise significantly.28. Why is remote work especially important during COVID19?A. It saves time. B. It blocks viruses.C. It saves money. D. It preserves privacy.29. What is the purpose of the third and fourth paragraphs?A. To emphasize importance.B. To sadden employers and employees.C. To demonstrate challenges.D. To pare benefits and drawbacks.30. The underlined word in the last paragraph can be replaced by .A. gaps B. challengesC. options D. prejudices31. What is the author39。s tone when talking about remote work?A. Critical. B. Objective.C. Subjective. D. Suspicious.DFor lots of animalshumans includedlazing about in the sunshine is one of life39。s greatest pleasures. But unfortunately, this leisure es with a cost: sunburn. And, while its most likely victims are the fairerskinned among us, animals are at risk of sunburn, too. But if this can happen to animals too, why, then, don39。t we ever see sunburned fish?If you think of it, the sun has been here forever in terms of our planet, and all individuals have been exposed to it, said Karina AcevedoWhitehouse, a molecular epidemiologist from the Autonomous University of Queretaro, in Mexico. So, it39。s a pretty strong selective pressure that the sun has put on animals and that has led to many mechanisms of reacting to it.Some of these mechanisms are obvious: hair, fur, wool, feathers and scales（魚(yú)鱗）on many creatures create a barrier between sunshine and skin.But, marine mammals（海洋哺乳動(dòng)物）, and specifically cetaceans（whales, dolphins and porpoises）, are an exception because they don39。t have fur。 they don39。t have scales, said AcevedoWhitehouse, who has been studying sunburn in whales for over five years.In skin samples taken from the backs of blue, sperm and fin whales on their crossocean migrations, AcevedoWhitehouse and her colleagues discovered signs of sunburn from the whales39。 hours spent breathing and socializing at the surface. But crucially, they also discovered that whales have specialized mechanisms that help them cancel out this burn. The mon adaptation of cetaceans is that they appear to be very effective at repairing damage, she said.Some whales generate colors that darken and protect their skin。 others have genes（基因）that set off a protective stress response in the skin. There are even whales that have developed a hard, keratinized layer（角質(zhì)層）that protects the delicate skin below. We were excited to see there isn39。t really evidence of skin cancer in whales, AcevedoWhitehouse said. Now, they39。re trying to understand precisely how those healing mechanisms work.32. Which of the following problems is the text trying to solve?A. Do whales ever get sunburnt?B. How do whales avoid sunburn?C. Do animals ever get sunburnt?D. How do mammals protect skin?33. What does the exception in Paragraph 4 refer to?A. Whales don39。t have fur to protect themselves.B. Whales can protect their skin even without fur.C. Whales build a wall between sunshine and skin.D. Whales39。 reacting mechanism is obviously found.34. In what situation do some whales probably get sunburnt?A. Breathing. B. Socializing above water.C. Sunbathing. D. Surfacing for a long time.35. Some whales adapt well to sun damage, depending on .A. rapid healing B. selfmade sun creamC. protective coats D. impossibility of cancer第二節(jié)（共5小題；，）閱讀下面短文，從短文后的選項(xiàng)中選出能填入空白處的最佳選項(xiàng)。選項(xiàng)中有兩項(xiàng)為多余選項(xiàng)。Many hear endlessly how good exercise is for our health, but you might be surprised to know just how good. 36 It helps you breathe better.Frequent exercise improves the volume of oxygen you can use in your body. This is what makes you fit and the benefits aren39。t limited to sport. 37 Attending some professional courses can build core strength and improve shape, and so strengthen breathing muscles.Physical activity enhances your mental health.Doing something active releases happy brain chemicals that make you more positive. The more you do it, the better you39。ll feel. But you do need to work up a bit of a sweat. If you39。ve had a bad day, treat yourself to a little bit of exercise. 38 39 The way your gut（內(nèi)臟）feels often impacts on your mental and physical health. Walking, running and yoga strengthen abdominal（腹部）muscles, increase heart rate and encourage your mu