2. 外语
  3. Ants first captured the attention of software engineers in the early 1990s. A single ant cannot do much on its own, but a group

Ants first captured the attention of software engineers in the early 1990s. A single ant cannot do much on its own, but a group

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问题     Ants first captured the attention of software engineers in the early 1990s. A single ant cannot do much on its own, but a group of ants【C1】______can solve complex problems. That inspired people like Marco Dorigo, who is one of the founders of a【C2】______known as group intelligence.
    Ants are good at choosing the shortest possible route between a food【C3】______and their nest. This reminds us of a classic computational travelling-salesman problem. Given a list of cities and their【C4】______apart, the salesman must find the shortest route needed to visit each city once. As the number of cities【C5】______, the problem gets more complicated.
    Ants solve their own problem using chemical signals called pheromones (信息素), when an ant finds food, she takes it back to the nest, 【C6】______a pheromone trail that will attract others. The more ants that【C7】______the trail, the stronger it becomes. 【C8】______, the pheromones evaporate (挥发) quickly, so once all the food has been collected, the trail soon goes cold. This rapid evaporation means long trails are less【C9】______than short ones, all else being equal. Pheromones thus turn the【C10】______intelligence of the individual ants into something more powerful.
【C6】
选项 A、putting aside
B、working on
C、waiting for
D、leaving behind
答案D
解析 本题测试词组。题干意思为：当一只蚂蚁找到食物时，她会将其带回自己的巢穴，留下信息素，来引起其他蚂蚁的注意。只有leave behind有“留下”的意思。故选D。
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