A．ambitiousB．lazyC．hardworkingD．cleverJack is a diligen……

单项选择题A rescue platform called the Eagle is capable of moving vertically but not sideways.

单项选择题The four propellers are fitted horizontally to the Eagle.

单项选择题With the help of jet engines, the Eagle can fly at a speed of 100 miles an hour.

单项选择题In the third paragraph, the word helicopter refers to the Eagle.

单项选择题The more jet engines are fitted to the propellers, the more people the platform can carry.