文章开头：Half of your brain stays alert and prepared for danger when you sleep in a new place
26. K) referred
27. O) volunteers
28. M) specifically
29. H) novel
30. I) potential
31. E) identified
32. L) species
33. G) marine
34. B) consciously
35. J) predators
文章开头：After becoming president of Purdue University in 2013, Mitch Daniels asked the faculty to prove that ....
26. L) significant
27. F) justify
28. E) drastically
29. D) doubtful
30. H) outcome
31. O) standardized
32. B) confirm
33. K) reputation
34. C) demanding
35. A) accurately
文章开头：Let's all stop judging people who talk to themselves. ...
Elite Math Competitions Struggle to Diversify Their Talent Pool
[F] 36. Middle school is a crucial period when students may become keenly interested in advanced mathematics
[A] 37. Elite school math competitions are attracting more interest throughout the United States.
[I] 38. Math circles provide students with access to advanced-math training by university professors.
[G] 39. Students may take advantage of online resources to learn to solve math problem.
[L] 40. The summer program run by a nonprofit organization has helped many underserved students learn advanced math.
[E] 41. Winners of local contests will participate in the national math competition for free.
[J] 42. Many schools don’t place academic competitions at the top of their priority list.
[B] 43.Contestants of elite high school math competitions are mostly Asian and white students from well-off families.
[M] 44. Some math training programs primarily focus on raising students’ math scores.
[H] 45. Some intensive summer programs are very expensive but most of them provide scholarships.
[G] 36. Working-class parents teach their children to be obedient and show respect to adults.
[F] 37. American parents, whether rich or poor, have similar expectations of their children despite different ways of parenting.
[C] 38. while rich parents are more concerned with their children’s psychological well-being, poor parents are more worried about their children’s safety.
[D] 39. The increasing differences in child rearing between rich and poor families reflect growing social inequality.
[G] 40. Parenting approaches of working-class and affluent families both have advantages.
[M] 41. Higher-income families and working-class families tend to live in different neighborhoods.
[K] 42. Physical punishment is used much less by well-educated parents.
[H] 43. Ms. Lareau doesn’t believe participating in fewer after-class activities will negatively affect children’s development.
[B] 44. Wealthy parents are concerned about their children’s mental health and busy schedules.
[P] 45. Some socioeconomic differences in child rearing have shrunk in the past ten years.
[D] 36. A number of factors are driving down the global oil prices not just for now but in the foreseeable future.
[L] 37. Pricing carbon proves the most economical way to reduce greenhouse gas emissions.
[J] 38. It is estimated that extreme weather conditions have endangered the lives of millions of African children.
[E] 39. The prices of coal are low as a result of over-supply and decreasing demand.
[H] 40. Higher fossil fuel prices prove to be conducive to innovation and application of cleaner technology.
[A] 41. If fossil fuel prices remain low for a long time, it may lead to higher emissions of greenhouse gases.
[G] 42. Fossil fuels remain the major source of primary energy consumption in today’s world.
[F] 43. Even major fossil exporting countries have great potential to develop renewable energies.
[O] 44. Greenhouse gas emissions, if not properly dealt with, will pose endless risks for mankind.
[B] 45. It is urgent for governments to increase the cost of using fossil fuels to an appropriate level to lessen the catastrophic effects of climate change.
46. B) They formulated a dress code with distinctive American features.
47. D) It was a completely new invention.
48. C) Ease of care
49. A) A shift of emphasis from beauty to utility.
50. C) They advocated equity between men and women.
51. D)They have changed the previous migration habits of certain birds.
52. D)They are more likely to be at risk of dying
53. B)They may eat something harmful.
54. C)They are not attracted to the rubbish dumps on their migration routes.
55. A)The potential harm to the ecosystem.
46. D) Open data sharing is conducive to scientific advancement.
47. A) Opposed.
48. C) The belief that research data is private intellectual property.
49. C) The changing attitude of journals and funders.
50. B) benefits sharers and users alike
51. A) It is attributable to the rising value of the U.S. dollar.
52. B) They cannot be attributed to weather only.
53. D) reduce the size of its staff
54. D) To be more competitive in sales of beauty products.
55. A) Sales dropped sharply in its physical stores.
46. A. It is backed by a campus spending analysis.
47. B. Facilities management by colleges is more cost-effective.
48. C. render a number of campus workers jobless.
49. A. The outsourcing plan is not yet finalized.
50. D. He opposed the governor’s plan to reconstruct the college board system.
51. B. It was unaffordable for ordinary people.
52. C. They were versed in literature and interested in art.
53. D. They gained some knowledge of classical art and architecture.
54. B. Europe hardly had any museums before the 19th century.
55. A. There appeared more and more Roman-style buildings.
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