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蛙式潜泳，臂划水的幅度要比蛙泳臂划水的幅度小。()

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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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蛙式潜泳，臂划水的幅度要比蛙泳臂划水的幅度小。()

抬头爬泳头部可以不露出水面。()

珍惜生命，乐于奉献是游泳救生员做好本职工作和履行其他道德义务的前提和建立职业情感的基础。()

救生圈要放置在游泳池馆的任何安全地方。()