3.　 The gas inside the ship lifts the craft into the air and then engines propel the craft forward.The pilot uses the rudder to control the direction of the craft.While most of the ships are filled with the lighter-than-air gas,there are also two compartments filled with normal air.4.　 To make the ship go up,the pilot reduces some of the normal air.Because that air is heavy,the ship becomes lighter and floats upward when it is reduced.To make the ship go down,the pilot can fill the compartments with more air. 

　　The first propeller-driven airship flew in 1852 in France.Its engine was powered by steam.The first rigid airship,with a body made of the metal Al,was built in Germany in 1897.One of the most successful builders of rigid airships was Ferdinand von Zeppelin.5. 

　　A.The gas H2 has great lifting ability.

　　B.He completed his first rigid airship in 1900.

　　C.Airships rely on several different features to enable them to fly.

　　D.These are actually a type of lighter-than-air craft called an airship.

　　E.The main section of an airship is filled with a gas that is lighter than air.

　　F.Like balloons,they are filled with a gas that allows them to float in the air.

　　G.The pilot can make the ship go up or down by controlling the amount of air in them.〚导学号95480039〛

　　Ⅲ.书面表达

　　阅读图画,按要求写一篇100词左右的英语短文。

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