“Ready for your trip to space.” You ask your son and daughter.Before the 21st century only specially trained astronauts went into space—and very few of them.Today anyone can go to space for day trips or longer vacation.Your best friend even works in space.Handing your children three strawberries each，you add，“The doctor said you need these for space travel.” Thanks to medical advice，vaccination shots(疫苗注射) are a thing of the past.Ordinary foods contain specific vaccines.With the berries in their mouths，the kids head for the front door.d unlocks the doors.“My office.Autopilot.” You command. Your car drives itself down the road and moves smoothly into traffic on the highway.You sit back and unroll your e­newspaper.The latest news downloads and fills the viewer.Looking through the pages，you watch the news as video films rather than read it.

　　20．What changes the color of your shirt?

　　A．The mirror.

　　B．The shirt itself.

　　C．The counter.

　　D．The medicine.

　　21．How do the shoes know that you shouldn't eat breakfast cereal?

　　A．By pouring breakfast cereal into a bowl.

　　B．By listening to the doctor's advice.

　　C．By testing the food supplies in the kitchen.

　　D．By checking the nutrition details of the food.

　　22．How is the text organized?

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