You have probably heard of homing pigeons (鸽子), which usually appeared in war. From 3,000 B．C．to the present, homing pigeons have 1 as postmen. They have been especially useful for carrying messages in time of war. The telegraph is not 2 to carry about. Sometimes only the little pigeon can take a message where it ought to go.

　　In 1870, when the Prussians surrounded the city of Paris, the city was cut off from all the 3 means of communication. The people 4 many different ways of 5 news. One way was to let go small balloons carrying mail. 6 of course, they only drifted 7 the wind carried them. Often they landed inside the enemy's lines. Even balloons large enough to carry a pilot could hardly be well controlled.

　　It was pigeons that in the end solved the 8 . Homing pigeons were brought into 9 . Soon they were carrying letters far and wide. The enemy bought 10 to catch pigeons, but the little postmen could fly faster than their 11 . Strangely enough, pigeons played an important 12 in war.

　　During World War I every army unit had a group of pigeons 13 . Many of them were 14 . Among them was an American pigeon with a French name Cher Ami, which meant “friend”. A group of U.S. soldiers were surrounded by the enemy. They had no food and no bullets. They nearly died of 15 There was 16 hope for them. Cher Ami made his way 17 the bullets and succeeded. At once planes set out to drop food and ammunition (军火) to them. With their strength 18 , the soldiers fought back to their own army and got saved.

　　 19 can pigeons carry the message? There were various methods. Usually the message is put into a little glass tube. The tube is tied to the leg or hidden under 20 or hung around the neck.

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　　You have probably heard of homing pigeons, which usually appeared in war. From 3,000 B．C．to the present, homing pigeons have 1 as postmen. They have been especially useful for carrying messages 2 war. The telegraph is not 3 to carry about. Sometimes only the little pigeon can take a message where it ought to go.

　　In 1870, when the Prussians surrounded the city of Paris, the city was cut off from all the 4 means of communication. The people 5 many different ways of sending news. One way was to let go small balloons carrying mail.

　　 6 of course, they only drifted 7 the wind carried them. Often they landed inside the enemy’s lines. Even balloons large enough to carry a pilot could hardly be well controlled.

　　It was pigeons that in the end. solved the 8 . Homing pigeons were brought into 9 . Soon they were carrying letters far and wide. The enemy bought 10 to catch pigeons, but the little postmen could fly faster than their 11 . Strangely enough, pigeons played an important 12 in war.

　　During World War I every army unit had a group of pigeons 13 . Many of them wore honored. Among them 14 an American pigeon with a French name Char Ami, which meant “dear friend”. A group of U.S. soldiers were surrounded by the enemy. They had no food and no bullets. They nearly died of 15 . There was little hope for them. Cher Ami made his way 16 the bullets and succeeded. At once planes 17 to drop food and ammunition (军火) to them. With their strength 18 , the soldiers fought back to their own army and got saved.

　　 19 can pigeons carry the message? There were various methods. Usually the message is put into a little glass tube. The tube is tied to the leg or hidden under 20 or hung around the neck.

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The teacher pats Tom__________when they are talking.

A. on his head B. on head　　　 C. on the head D. in his head