解析:我们摸索着下了台阶,“呼吸(breathe)”着甜美新鲜的夏日的空气,到了她家的院门。show“展示,呈示”;notice“注意到,留意到”;lose“失去,丢失”。
答案:D
.阅读理解
A
Pretoria,South Africa—Hundreds of swimmers play in the water along a South African beach.Suddenly a huge shark appears offshore and heads for the bathers.Before it can get close to the swimmers,the shark,for some mysterious reason,starts swimming parallel to the beach.Then it turns back from shore and heads out to the sea,leaving the swimmers untouched.
Such a scene will soon become common along sharkinfested(鲨鱼成群的)shores.An electrical engineer from the University of Pretoria has developed an electrical system that repels(击退)sharks by controlling their movements.Confused by this action,the sharks end up turning back from the beach.
In this unusual shark repellent method,an insulated(绝缘的)cable is buried on the bottom of the sea around a beach from which people swim.When an electric current is sent through the cable,an electric field is produced in the water above the cable.
When the shark swims into the electric field,nerve cells just below the shark's skin detect the field.The electricity produces a reflex(反射)action in the shark's muscles,causing the dangerous animal with sharp teeth to swim parallel to the cable.Confused by increasing loss of control of its muscles,the shark suddenly changes its direction and heads seaward,away from the electric field.
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