in Paragraph 4 probably mean?

　　A. Decrease.

　　B . Increase.

　　C . Improve.

　　D. Adjust.

　　30. The similarity of white tea and green tea is that

　　A. they can prevent tooth rot

　　B. they can keep the cholesterol levels

　　C. they can contribute to losing weight

　　D. they can contain low doses of caffeine

　　31. What is the best title of the passage?

　　A. The benefits of tea.

　　B. Main varieties of tea.

　　C. The differences of tea.

　　D. Main functions of tea.

　　D

　　Over the next decade, technology will decimate more jobs in many professions.

　　Some robots already cost less to operate than the salaries of the humans they replace, and they are getting cheaper. Boston Consulting Group predicts that, by 2025, the operating cost of a robot that does welding(焊接) will be less than

　　$2 per hour, for example. That's more affordable than the

　　$25 per hour that a human welder earns today in America.

　　Uber and many other companies are working on developing cars and trucks that don't need a driver in the driver's seat. According to the American Trucking Associations, approximately 3 million truck drivers were employed in the United States in 2010,and 6. 8 million others were employed in other jobs relating to trucking activity. So roughly one of every 15 workers in the country is employed in the trucking business. We could be talking about millions of jobs disappearing in the early 2020s.

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