- The first important exposition in the United States was held in Philadelphia in 1876.
- Despite the proliferation of other faster modes of transportation, the railroads remain the largest carriers of intercity freight in the United States.
- How many people are aware that a dancer with the New York City Ballet typically wears out a minimum of two hundred pairs of toe shoes per year?
- The fear of smallpox, which terrorized the eighteenth century, has no analogy(likeness) today.
- All living organisms, regardless of their unique identity, have certain biological, chemical, and physical characteristics in common.
- The flower bud of a water lily 百合 opens at sunset since .its opening is triggered(commence) .by the decreased light.
- Food must be moist in order to have a taste.
- With lasers scientists can probe many physical processes, such as combustion, once beyond our ken.视野
- Some children display an unquenchable 难以抑制的 curiosity about every new thing they encounter.
- Some animals pant and sweat to speed evaporation of body moisture and thus cool themselves.
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