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    () 4. He is hard-working and . I hope he will have more - at is business.

       A. success;successful   B. successful;success

       C. successfully;successful   D. successful;successful

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    六、阅读理解(20分)

                  (A)

        Men have always wanted to fly like birds. Birds can fly easily because they are light,but men's bodies are heavier.

        Men first went up into the air in balloons. These are big bags,and they are filled with gas. Hydrogen (氢气) is a useful gas for galloons. It is lighter than air. Helium is also lighter than air,but it costs a lot of money. So balloons are usually filled with hydrogen.

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