56. How will Australian scientists solve the problem of global warming?

　　A. Eating more kangaroos.

　　B. Killing more cattle and sheep.

　　C. Letting cattle and sheep pass less wind.

　　D. Transferring the special bacteria in kangaroos’ stomachs to cattle and sheep.

　　完形填空 （共20小题； 每小题1分，满分20分）

　　It was the district sports meet. My foot still hadn’t healed（痊愈）from a（n） 36

　　injury . I had

　　37

　　whether or not I should attend the meet. But there I was

　　38

　　for the 3,000-meter run.

　　“Ready … set…” The gun popped and we were off. The other girls rushed

　　39

　　me . I felt

　　40

　　as I fell farther and farther behind.

　　“Hooray!” shouted the crowd. It was the loudest

　　41

　　I had ever heard at a meet. The first-place runner was two laps（圈）ahead of me when she crossed the finish line. “Maybe I should

　　42 , ” I thought as I moved on.

　　43 . I decided to keep going. During the last two laps, I ran

　　44

　　and decided not to

　　45

　　in track next year. It wouldn’t be worth it,

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