题型：任务型阅读 题类：常考题 难易度：普通
人教版(2019)高中英语必修第三册2020-2021学年Unit 4 Space Exploration单元素养评价
Long before we had airplanes, people had been experimenting with different flying machines. We still use some of those flying machines today.
Hot-air balloons and gliders(滑翔机) use air currents(气流) for movement. Hot-air balloon pilots control their aircraft by going up or down into air currents that move the balloon. The pilot controls the balloon's movement by heating the air inside the balloon, or by allowing it to cool naturally. Small planes pull gliders along a runway to help them take off. But once in the air, gliders use the currents, not an engine, to move. Their long wings and strong body give riders a safe, smooth flight.
Helicopters(直升机) first appeared during World War Ⅱ. A helicopter doesn't have wings, but, like an airplane, it has an engine that makes its blades(螺旋桨) move at high speeds. This allows the helicopter to rise into the sky. But helicopters can stay in one place in the sky for a long time. Today helicopters are mostly used by medical teams and the army. But you can also take a helicopter ride for fun.
So before your next aircraft ride, remember that airplanes aren't the only way to fly.
A. An airplane has to keep moving.
B. Gliders also use air currents to rise and glide.
C. Learning to fly a helicopter isn't a simple task.
D. Hot-air balloons and gliders are most often used for fun.
E. Some depend on air for movement, while others use engines.
F. Many tourist attractions offer helicopter rides for sightseeing.
G. Every flying machine has its own special characteristics, some good, some not so good.
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