2. 外语
  3. Read the following passage and decide which answer best fits each space. For questions 26~45, mark one letter A, B, C or D o

Read the following passage and decide which answer best fits each space. For questions 26~45, mark one letter A, B, C or D o

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问题     Read the following passage and decide which answer best fits each space.
    For questions 26~45, mark one letter A, B, C or D on the Answer Sheet.
    Both【C1】______and zoology are parts of a more general field of science, biology. The two are studies of【C2】______things, which share certain characteristics,【C3】______they are plants or animals. Botany deals with plants, whose organisms that can【C4】______their own food by the use of sunlight. Zoology on【C5】______hand, deals with animals, those organisms that cannot manufacture their own food and are thus dependent【C6】______plants for their food.
   【C7】______plants and animals share many abilities, the extent【C8】______which plants can exercise some of those abilities is【C9】______. For example, both plants and animals need food, water, and warmth for growth,【C10】______plants can move to【C11】______those needs only by the slow extraction of their leaves and roots, while animals can move relatively【C12】______distances in relatively little time. When an animal is hurt with needle, the animal will【C13】______the part of the body【C14】______. This ability to draw back【C15】______pain or irritation, called irritability, is found only to a very limited extent in plants.
    If plants【C16】______the same【C17】______as animals, animals would have had a more difficult time finding food. If animals were as limited as plants, they might【C18】______a means of manufacturing their own food, as plants do now. The world would be a very different place【C19】______it is if the characteristics of plants and animals were【C20】______.
【C18】
选项 A、evolve
B、have evolved
C、be evolved
D、be evolving
答案B
解析 考点：虚拟语气。分析：本句意为：“如果动物受到植物那样的限制，它们——已经产生了一种自产食物的能力，就像现在的植物一样。”本句为虚拟语气，从句为一般过去时，主句应为“might+have+过去分词”的结构，表示对过去情况的虚拟，故选项B正确。
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