According to medical data, the incidence of global cancer in the second half of the 20th century increased by nearly 10 times compared with the first half, becoming the number one killer of human life. This shows that the economy of the second half of the 20th century, marked by high technology, was rapid. The global ecological imbalance caused by development is an important cause of cancer. Which of the following items, if true, can weaken the above discussion, except? ['The average life expectancy of human beings is about 30 years in the early 20th century, about 40 years in the middle of the 20th century, and currently about 65 years. The average life expectancy in developed countries with a high incidence of cancer is generally more than 70 years.', 'In the first half of the 20th century, mankind experienced two world wars, and a large number of young and middle-aged people died in the war; while in the second half of the 20th century, the world was basically in a period of peaceful development.', 'High technology has greatly improved the accuracy of medical diagnosis and the coverage of this accurate medical diagnosis worldwide.', 'High technology has greatly improved the ability of humans to prevent and diagnose cancer, effectively extending the life of cancer patients.']