2. 外语
  3. Which of the following may NOT happen this Tuesday?

Which of the following may NOT happen this Tuesday?

admin2022-03-08  50
问题 Which of the following may NOT happen this Tuesday?
  
Thailand’s Ministry of Natural Resources and Environment called on people nationwide to refrain from using single-use plastic bags to mark the Thai Environment Day, which falls on this Tuesday. Convenience stores and shopping malls have also agreed to tuck away single-use plastic bags to shoppers on the Environment Day.
Deoxyribonucleic acid, DNA for short, is a molecule composed of two chains that coil around each other to form a double helix carrying the genetic instructions used in the growth, development, functioning and reproduction of all known living organisms and many viruses.
选项 A、It is a single-strand folded onto itself.
B、It is a paired double-strand spirally shaped.
C、It is made up of two unbent strands connected to each other.
D、It is a molecule carrying genetic information.
答案B
解析 语义的理解与画面构建。本段介绍的是DNA，包括其形状、功能和存在范围。而该题所问的是“What does DNA look like”，即DNA是什么样子的。因此，首先排除选项D，与所问无关。再根据原文与DNA形状有关的陈述，“a molecule composed of two chains that coil around each other to form a double helix”，可知DNA是双链分子，两条链呈螺旋状连接，形成双螺旋结构。选项A将DNA描述为单链结构(single，strand) ，错误。选项C将DNA描述为直链(unbent) ，错误。因此，本题应选择选项B。
(1) 根据题干确定目标内容，排除干扰项。
(2) 根据语义确定原文所描述事物的轮廓。本题的作答首先应建立在对题干的理解基础上，明晰所问是DNA的外观，而非其他方面。此外，本题还考查对词汇的把握，如helix。
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