题目内容：

Have you ever seen the film Traveling Bird? In the film, groups of birds fly high above the sky   1.  . I’m sure you will love the beautiful picture   2.  .

But you may not feel so good if you have learnt about bird flu(禽流感)from TV or on the Internet．Some governments had to kill chickens in their cities．A large number of chickens   3.  and nearly 8,500 birds died in Russia because of bird flu．

Chickens can get bird flu from the feces(粪便)of the passing birds．It is not so difficult to control the chickens in cages or on farms． 4.

Luckily ,scientists have found a medicine for bird flu．5.  So bird flu is still a serious problem we must face．

从方框中所给的选项中选出能填入空白处的最佳选项，补全短文。其中有一项为多余选项。(其中E答案在答题卡中涂A、B; F答案在答题卡中涂A、C)

A．and even some people died in Asia． B．But the virus(病毒) can change easily and quickly C．when you see the film． D．But it is much more difficult to control the birds in the sky． E．And the virus has been controlled already F．and cross the way above snow, rivers, fields, sea and grassland．