Roller coasters typically cost no more than $30 million, but the zero-gravity ride would cost $50 million or more, to a large extent because the precision-response propulsion system（推进系统） is so complex. But if someone were to write a check today, Rogers says, his company could be sending riders on weightless journeys by the end of 2016.

　　1. What makes BRC's coaster different?

　　A. It's the tallest roller coaster in the States.

　　B. It's the fastest roller coaster on Earth.

　　C. It can bring a sensation of zero gravity to its riders.

　　D. It is a NASA product.

　　2. Why would people in BRC's coaster have an illusion of floating in the chamber?

　　A. Because it's designed with the inspiration of Superman.

　　B. Because a special functioning motor system is applied to it.

　　C. Because the coaster can approach a top speed of more than 100 mph.

　　D. Because the coaster would cost $20 million more than normal ones.

　　3. At what point could a rider begin to feel weightless?

　　A. When the coaster reduced its speed immediately after it reached its top speed.

　　B. When the coaster began to increase its speed.

　　C. When the coaster reduced its speed to a stop back at the base station.

　　D. When the coaster reached the top of the track.

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