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问题 单项选择题

有关HIV感染临床Ⅲ期的描述，下列哪项是错误的()

A．表现为短期全身淋巴结肿大综合征

B．全身有两处或两处以上淋巴结的肿大

C．淋巴结肿大直径在1cm以上，质地柔韧，无压痛，无粘连

D．淋巴结活检为反应性增生

E．有传染性

答案

参考答案：A

判断题

荒煤气和焦油氨水在气液分离器中分开。
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单项选择题

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 (52) can solve complex problems. That inspired people like Marco Dorigo, who is one of the founders of a (53) known as group intelligence.

Ants are good at choosing the shortest possible route between a food (54) and their nest. This reminds us of a classic computational travelling-salesman problem. Given a list of cities and their (55) apart, the salesman must find the shortest route needed to visit each city once. As the number of cities (56) , 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, (57) a pheromone trail that will attract others. The more ants that (58) the trail, the per it becomes. (59) , 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 (60) than short ones, all else being equal. Pheromones thus turn the (61) intelligence of the individual ants into something more powerful.

55().

A. locations

B. positions

C. spaces

D. distances
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