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With some Chinese cities slated to implement compulsory garbage sorting regulations, teams from China-UK Low Carbon College at Shanghai Jiao Tong University have been working to devise more efficient means of accomplishing this task through the use of high-end technology.
Among the ongoing projects in the college is a robot that can sort dry waste. According to the team behind this project, the machine can identify a piece of dry waste before placing it in its respective container. The device currently boasts a 90 percent accuracy rating and can sort up to 5400 pieces of waste per hour "Workers involved in manual sorting of unseparated domestic waste are exposed to unhygienic environments, “says Li Jia, the project leader and associate professor at the college. "The work also poses risks to workers， safety as there are sometimes items such as sharp metal pieces of broken glass that could hurt them. Robots would be useful for
such repetitive and arduous tasks. Two robots operating for 24 hours a day can handle the workload of 54 workers, and with higher efficiency.“
Li notes that there is a lack of waste-sorting equipment in the domestic market, and such products developed by other countries are prohibitively expensive—a single unit could cost up to 10 million yuan ($1. 4 million) . Maintenance costs are as high as well.
Equipped with three kinds of cutting-edge sensors and other technologies like contour (轮 廓) identification, the machine can identify the color, shape and texture of an object, as well as what it is made of. An algorithm］算法)also enables the robotic arm to determine the most efficient way to fetch items.
According to Li, the team will cooperate with factories and companies to conduct performance assessments on the robot. " The components of garbage are different in every city and neighborhood, and these varying elements will affect the performance of the machine, “he says, “The robots need to be trained to work in the real environment."
39.What is the main purpose of the first paragraph?
A.To offer an explanation. B. To introduce the topic.
C. To present one argument. D. To put forward a suggestion.
40.What does Paragraph 2 center on?
A.The efforts put into the ongoing project.
B.The harsh working conditions of dustmen.
C.The risks and accomplishments of using high-end technology.
D.The advantages of garbage sorting robots over manual workers.
41.Which of the following is a feature of the machine devised by Li s team?
A.It is prohibitively expensive.
B.Its maintenance costs are high.
C.It can identify the contour of an object.
D.It is equipped with a single sensor.
42.What can we infer from the last paragraph?
A.The robot may have its limitations in practice.
B.The robot is by far the most efficient of its kind.
C.Assessments on the robot have been all conducted.
D.Workers don，t need to be trained to operate the robot.
 

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