64. D 推理判断题。根据第三段最后两句“…ONB groups fall off the polymer, leading to its breakdown.”和“…and it could be poisonous to cells…”可知答案。
65. C 信息理解题。根据最后一段第五句“When the Bhcs absorb NIR light, the reactive groups are exposed and break the long polymer into two short chains.”可知此处用exposed,即C项正确。
B
51. 答案:C
考点::考查学生的推理能力
解析: “I’m so glad I did”是个承上启下的句子,为后文做了铺垫。只要读懂后文所讲的内容,简单概括一下,不难得出答案
52. 答案:B
考点::细节理解
解析:从 “it was protected by the arms of a bay that had only one tiny channel to the sea. As we got on board, we noticed two big humps(脊背) in the distance. ”53. 答案:D
考点::细节理解
解析:从 “She’s trying to help her baby, but on the wrong side, ” 可以得出答案
54. 答案:A
考点::考查主旨大意
解析:从文章最后一段可以概括出来
C
【文章大意】文章介绍了怎样培养向后滑冰,只要遵循步奏,你就会不断进步,最后成为倒滑高手。
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