D. It is widely accepted by language teachers. Ks5u

　　50. We learn from the text that Sulzberger ________. Ks5u

　　A. spent seven years doing his research Ks5u

　　B. had majored in Russian at University Ks5u

　　C. has helped many students who have difficulties learning Ks5u

　　D. thinks it important for learners to involve themselves in the language they are learning Ks5u

　　D Ks5u

　　Space is full of fireworks: Galaxies smash into each other, dying stars explode and high-energy particles race toward us at the speed of light. The most powerful explosions in the universe are brilliant flashes of light called gamma-ray bursts. If you happened to fly through the neighborhood of a gamma-ray burst, you couldn’t miss the flare — it would be brighter than a million trillion suns. Ks5u

　　On September 15, 2008, a gamma-ray burst in the constellation Carina was recorded. This February, after studying the data, astronomers announced the gamma-ray burst was the most energetic explosion ever seen. Ks5u

　　Since the explosion was more than 12 billion light-years away, we didn’t see it. Ks5u

　　Gamma-ray bursts are nearly impossible to study from Earth because our atmosphere blocks the view. But scientists found a way around that problem. Last June, NASA launched a new telescope called the Fermi Gamma-ray telescope into orbit by strapping it on the back of a rocket. The instrument is helping scientists watch these deep-space fireworks displays. It’s named after Enrico Fermi, an Italian-American physicist who helped design the first atomic bomb and also studied gamma-ray bursts. Ks

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