| When we accept the evidence of our unaided eyes and
describe the Sun as a yellow star, we have summed up the most important single
fact about it--at this moment in time. It appears probable, however, that
sunlight will be the color we know for only a negligibly (微不足道的) small part of
the Sun’s history. Stars, like individuals, age and change. As we look out into space, we see around us stars at all stages of evolution. There are faint blooded dwarfs so cool that their surface temperature is a mere 4,000 degrees Fahrenheit; there are scaring ghosts blazing at 100,000 degrees Fahrenheit and almost too hot to be seen, for the great part of their radia-tion is in the invisible ultraviolet range. Obviously, the "daylight" produced by any star depends on its temperatu A. Faint dwarf stars. B. The evolution cycle of the Sun. C. The Sun’s fuel problem. D. The dangers of invisible radiation. 更多"{{B}}Passage 3{{/B}}{{B}}Questions "的相关试题: [单项选择]
A. Humans got equal teamwork with ants. B. Ants usually accomplish the most complex tasks. C. Ants communicate through chemicals. D. Ants have an amazing ability to specialize behavior. [单项选择]{{B}} Passage One
Questions 26 to 28 are based on the passage you have just heard.
{{/B}}
A. 1520. B. 6020. C. 1755. D. 1620. [单项选择]{{B}}Passage 3{{/B}} {{B}}Questions 11 to 15 are based on the following passage.{{/B}}
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