33.Some famous figures are mentioned in Para.6 to indicate _____________.

34.“Tissue rejection” emerges due to the fact that_____________.

35.The most appropriate title for this text may be ______________.

36.The provision date from NCHS is cited to show _____.

37.According to paragraph 2, which of following statements is true?

38.What could be inferred from the statements of both Hamilton and Kohler?

39.Compared with other countries, the US ______.

40.What's the author's attitude to the change of American population?

41.Travelers love animals. We want to get close to them and learn more about them. But the reality that many tourists don’t see is that to stay in business, animal encounters, such as elephant rides and photo ops with tigers, rely on putting wild creatures to work. Discerning the difference between ethical and problematic wildlife experiences is among the thorny issues addressed in National Geographic magazine’s feature story “Suffering unseen: The dark truth behind wildlife tourism.” For visitors to environments ranging from zoos to national parks, it can be especially difficult to determine how to observe animals humanely. To assess how facilities treat captive animals, you can refer to the “five freedoms”—internationally recognized standards inspired by a 1965 U.K. government report. Consider these tips before your next wild adventure: 41 . ____________ Look for facilities where animals appear to be well-fed and have access to clean water at all times. A facility that rates high on Trip Advisor may not be a humane one. Read one- and two-star reviews, which often include animal welfare concerns cited by visitors. 42 . ______________ Observe whether animals have an appropriate environment, including shelter, ample space, a comfortable resting area, and a secluded place away from crowds. Beware of buzzwords including “gives back to conservation,” “sanctuary,” and “rescue.” Be cautious if a facility makes these promises yet offers extensive interaction to large volumes of people. 43 . ______________ Avoid facilities where animals are visibly injured or are forced to participate in activities that could injure them or cause them pain or where enclosures aren’t clean. Being chained, performing, and interacting with tourists—giving rides, posing with them, being washed by them—are not normal for a wild animal, even one born in captivity. 44 . ______________ Be aware that large crowds and unnatural noises cause distress, especially for animals that have experienced fear-based training, separation from mothers at birth, or other traumas. 45 . ______________ Seek experiences that offer observation of animals engaging in natural behaviors in natural environments and share them widely with other .The global wildlife tourism industry should be entrepreneurial. Individual actions can make a collective difference, signaling to the market that consumers support ethical wildlife encounters. When travelers decide they want humane treatment of animals, the wildlife tourism market will change for the better.

42.Travelers love animals. We want to get close to them and learn more about them. But the reality that many tourists don’t see is that to stay in business, animal encounters, such as elephant rides and photo ops with tigers, rely on putting wild creatures to work. Discerning the difference between ethical and problematic wildlife experiences is among the thorny issues addressed in National Geographic magazine’s feature story “Suffering unseen: The dark truth behind wildlife tourism.” For visitors to environments ranging from zoos to national parks, it can be especially difficult to determine how to observe animals humanely. To assess how facilities treat captive animals, you can refer to the “five freedoms”—internationally recognized standards inspired by a 1965 U.K. government report. Consider these tips before your next wild adventure: 41 . ____________ Look for facilities where animals appear to be well-fed and have access to clean water at all times. A facility that rates high on Trip Advisor may not be a humane one. Read one- and two-star reviews, which often include animal welfare concerns cited by visitors. 42 . ______________ Observe whether animals have an appropriate environment, including shelter, ample space, a comfortable resting area, and a secluded place away from crowds. Beware of buzzwords including “gives back to conservation,” “sanctuary,” and “rescue.” Be cautious if a facility makes these promises yet offers extensive interaction to large volumes of people. 43 . ______________ Avoid facilities where animals are visibly injured or are forced to participate in activities that could injure them or cause them pain or where enclosures aren’t clean. Being chained, performing, and interacting with tourists—giving rides, posing with them, being washed by them—are not normal for a wild animal, even one born in captivity. 44 . ______________ Be aware that large crowds and unnatural noises cause distress, especially for animals that have experienced fear-based training, separation from mothers at birth, or other traumas. 45 . ______________ Seek experiences that offer observation of animals engaging in natural behaviors in natural environments and share them widely with other .The global wildlife tourism industry should be entrepreneurial. Individual actions can make a collective difference, signaling to the market that consumers support ethical wildlife encounters. When travelers decide they want humane treatment of animals, the wildlife tourism market will change for the better.