This invention is a stove that’s so small it can fit in a back pocket. It weighs only four ounces and uses
small tablets of fuel. There’s yet another invention you might not know about. It’s a tennis racket that
beeps whenever the ball is hit in the centre of the strings. That’s the best place to hit the ball. The beep
helps a player learn to strike the ball correctly time after time.
A. Are hard to design
B. Can help people get better jobs
C. Are costly
D. Are sometimes unusual
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