听力短文1：No one knows for sure just how old kites are。

No one knows for sure just how old kites are。 In fact， they have been in use for centuries。 25 centuries ago， kites were well-known in China。 These first kites were probably made of wood。 They may even have been covered with silk， because silk were used a lot at that time。 Early kites were built for certain uses。 In ancient China， they will use to carry ropes to cross rivers。 Once across， the ropes were tear down and wooden bridges would hang for them。 Legend tells of one General who flew musical kites over the enemies’ camp。 The enemy fled， believing the sounds to be the warming voices of angels。 By the 15th century， many people flew kites in Europe。 Marco Polo may have brought the kite back from his visit to China。 The kite has been linked to great names and events。 For instance， Benjamin Franklin used kite to prove the lightening electricity。 He flew the kite in the storm。 He did this in order to draw lightening from the clouds。 He tied a metal key and a strip of silk to the kite line。 The silk ribbon would stop the lightening from passing through his body。 Benjamin’s idea was first laughed at。 But later on， it enlightened the invention of the lightening rod。 With such grand history， kite flying is short remain an entertaining and popular sport。

Question 16 to 18 are based on the passage you have just heard。

Question 16： What does the speaker say about kite？

Question 17： What did ancient Chinese use cats to do？

Question 18： Why did BF flied a kite in the storm？