搜题请搜索小程序“爱下问搜题”
问题 选择题

折线图说明了什么问题

A．1932年的工业产值比1929年下降了36.2亿美元

B．此表证明了苏联这个时期重工业急速发展起来的史实

C．随着时间的推移，世界工业生产不断扩大

D．世界范围的大萧条沉重打击了资本主义各国的工业生产

答案

答案：D

选择题

古代中国最重要的生产部门是

A．农业

B．手工业

C．商业

D．工业
查看答案
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.

56().

A.changes 

B.holds 

C.grows 

D.decreases
查看答案