Earthquakes, volcanic eruptions, and unusual weather have caused many more natural disasters adversely affecting people in the past decade than in previous decades. We can conclude that the planet Earth as a natural environment has become more inhospitable and dangerous, and we should employ the weather and earth sciences to look for causes of this trend. The conclusion drawn above is most seriously weakened if which of the following is true？
A. The weather and earth sciences have provided better early warning systems for natural disasters in the past decade than in previous decades.
B. International relief efforts for victims of natural disasters have been better organized in the past decade than in previous decades.
C. There are records of major earthquakes, volcanic eruptions, droughts, landslides, and floods occurring in the distant past, as well as in the recent past.
D. Population pressures and poverty have forced increasing numbers of people to live in areas prone to natural disasters.
E. There have been no changes in the past decade in people"s land-use practices that could have affected the climate.
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Since the Airline Deregulation Act of 1978, major airline companies in the United States have cut their employee ranks by more than 3,000 persons. Thus, although deregulated competition has afforded consumers dramatically lower fares, the economy of the United States has been harmed by deregulation of the airlines. The argument above would be most seriously weakened if it were true that
A. a poll of people in the United States expressed exceptionally strong support for airline deregulation.
B. fewer passengers now travel on commercial airlines than traveled on them in 1978, with the consequence that fewer employees are needed to operate the airlines than were needed in 1978.
C. airlines now fly a more restricted regular schedule of routes than they did in 1978, with the consequence that the industry is more highly concentrated and competitive than it was before 1978.
D. several major airlines now enjoy significantly higher profits and levels of employment than they did in the years preceding the Deregulation Act.
E. smaller carriers of passengers have thrived as a result of deregulation and now provide more new jobs than the major airlines have eliminated since 1978.
张飞是没有自知之明的自恋，关羽是没有共同感情的自恋。()
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