51. Where can nanoplastics be found in our body?
- A. The blood.
- B. The lung.
- C. The stomach.
- D. Almost everywhere.
答案：D
答案句：Nanoplastics are just 1/1000th the width of an average human hair — so tiny that experts say they can migrate through the tissues of the digestive tract (消化道) or lungs into the bloodstream, distributing potentially harmful artificial chemicals throughout the body and into cells.
参考译文：纳米塑料只有平均人类头发宽度的千分之一——如此之小，专家说它们可以穿过消化道或肺部的组织进入血液，将潜在有害的人造化合物流布全身并进入细胞。
定位线索：题干“Where can nanoplastics be found in our body”→答案句“migrate through the tissues of the digestive tract or lungs into the bloodstream, distributing ... throughout the body and into cells”；文中“throughout the body”对应选项D“Almost everywhere”。
解析：题干问纳米塑料在体内何处可被发现。答案句明确指出它们可穿过消化道或肺部组织进入血液，并分布到全身和细胞中，因此可推出它们几乎无处不在，对应D项。A、B、C都只是部分位置，属于以偏概全，而D项全面概括了答案句中的“throughout the body”。
52. What are the differences between nanoplastics and microplastics?
- A. Nanoplastics are harmful, while microplastics aren’t.
- B. Nanoplastics exist in bottled water, while microplastics don’t.
- C. Nanoplastics can migrate through certain tissues, while microplastics can’t.
- D. Nanoplastics are relatively bigger, while microplastics are much smaller.
答案：C
答案句：Nanoplastics are just 1/1000th the width of an average human hair — so tiny that experts say they can migrate through the tissues of the digestive tract (消化道) or lungs into the bloodstream, distributing potentially harmful artificial chemicals throughout the body and into cells.
参考译文：纳米塑料只有平均人类头发宽度的千分之一——如此之小，专家说它们可以穿过消化道或肺部的组织进入血液，将潜在有害的人造化合物流布全身并进入细胞。
定位线索：题干“differences between nanoplastics and microplastics”→答案句“migrate through the tissues”；文中“migrate through the tissues”对应选项C“can migrate through certain tissues”。
解析：题干问纳米塑料和微塑料的区别。答案句强调纳米塑料因极小能穿过组织，而文中对微塑料的描述（第4段）只提到尺寸范围，未提及迁移能力，因此可推出纳米塑料能迁移而微塑料不能，对应C项。A项文中未比较危害性，B项文中两者都存在，D项尺寸关系颠倒，均错误。
53. Why is Jane Houlihan’s statement mentioned in paragraph 7?
- A. To add more background information for the new study.
- B. To provide evidence for the discussion of plastic hazard.
- C. To provide an objective evaluation of the new study.
- D. To encourage readers to focus on the new study.
答案：C
答案句：“The innovative techniques presented in the study open the door for further research to better understand the potential risks to human health.” said Jane Houlihan, research director for Healthy Babies, Bright Futures — a nonprofit committed to reducing babies’ exposures to neurotoxic (毒害神经的) chemicals, who was not involved in the study.
参考译文：“研究中提出的创新技术为进一步研究打开了大门，以更好地了解对人类健康的潜在风险。”健康婴儿光明未来组织的研究主任简·霍利汉说，该组织是一个致力于减少婴儿接触神经毒性化学品的非营利组织，她并未参与这项研究。
定位线索：题干“Why is Jane Houlihan’s statement mentioned”→答案句“The innovative techniques presented in the study open the door for further research”；文中“open the door for further research”对应选项C“provide an objective evaluation”。
解析：题干问为何提及Jane Houlihan的陈述。答案句显示她评价研究技术“为未来研究打开大门”，且她“未参与研究”，说明她的评价客观中立，对应C项。A项“增加背景信息”不准确，她的陈述是评价而非背景；B项“提供证据”不准确，她未提供数据；D项“鼓励读者关注”无中生有。
54. What is the meaning of the underlined word “vulnerable” in paragraph 8?
- A. Fragile.
- B. Optimistic.
- C. Emotional.
- D. Ignorant.
答案：A
答案句：“Infants and young children may face the greatest risks, as their developing brains and bodies are often more vulnerable to impacts from toxic exposures.” said Houlihan in an email.
参考译文：“婴幼儿可能面临最大风险，因为他们发育中的大脑和身体往往更容易受到有毒物质暴露的影响。”霍利汉在电子邮件中说。
定位线索：题干“vulnerable”→答案句“more vulnerable to impacts from toxic exposures”；文中“more vulnerable to”对应选项A“Fragile”（脆弱的）。
解析：题干问vulnerable的含义。答案句中“婴幼儿发育中的大脑和身体更容易受到有毒物质影响”，说明vulnerable意为“脆弱的、易受伤害的”，对应A项Fragile。B项“乐观的”、C项“情绪化的”、D项“无知的”均不符合语境。
55. What would be the best title for the passage?
- A. Nanoplastics: A Newly Discovered Plastic Type
- B. Bottled Water: High Levels of Nanoplastics and Their Health Risks
- C. How to Reduce Exposure to Plastics in Daily Life
- D. The Difference Between Nanoplastics and Microplastics 第II卷 注意事项： 1.用黑色墨水的钢笔或签字笔将答案写在答题卡上. 2.本卷共6小题,共35分.
答案：B
答案句：In a groundbreaking new study, researchers discovered bottled water sold in stores can contain 10 to 100 times more bits of plastic than previously estimated — nanoplastics (纳米塑料) are so tiny that they cannot be seen under a microscope. … Nanoplastics are the most worrisome type of plastic pollution for human health, experts say. … There are things people can do to reduce their exposure to plastics, said Houlihan.
参考译文：在一项开创性的新研究中，研究人员发现商店出售的瓶装水所含塑料碎片比之前估计的高出10到100倍——纳米塑料非常小，在显微镜下都看不到。……专家说，纳米塑料是对人类健康最令人担忧的塑料污染类型。……霍利汉说，人们可以采取一些措施减少接触塑料。
定位线索：题干“best title”→答案句“bottled water ... contain ... nanoplastics”、“most worrisome type ... for human health”；文中“bottled water”对应选项B“Bottled Water”，“health risks”对应“worrisome ... for human health”。
解析：题干问最佳标题。答案句首段点明瓶装水中含大量纳米塑料，后文强调其对健康的担忧，末段提出减少接触的方法，整体围绕“瓶装水中纳米塑料及其健康风险”，对应B项。A项只提纳米塑料类型，未提瓶装水；C项只提减少接触，是部分内容；D项只提区别，非主旨。