5 The corona rays are made up of gases streaming outward at tremendous speeds and reaching a temperature of more than 2 million degrees Fahrenheit. The rays of gas thin out as they reach the space around the planet. By the time the Suns corona rays reach the Earth, they are weak and invisible.
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A.Basic description of the core
B. Characteristics of the corona
C. The composition of the corona rays
D. Five layers of zones of the sun
E. Characteristics of the corona rays
F. The eclipse in February 1979
正确答案:DBEC
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