Directions: In the question below, the 1^st and the last (correctly ordered) sentences are numbered 1 and 6. The rest of the passage is split into four parts and named B, C, D and E. These four parts are not given in the proper order. Choose the correct combination among the four alternatives given.

1. The sun has been shedding light and energy on Earth for about 4.5 billion years. B. And while it provides us with life, it can also ­be dangerous. C. That's a lot of heat, and if you're not careful, it can cause a lot of damage. D. That means, humans have only been around to enjoy a fraction of it. E. After all, the center of the sun burns at roughly 10 million degrees Fahrenheit (5.5 million degrees Celsius).
2. Looking directly at the sun, even for a few minutes, can blind you permanently.