干硬性混凝土的坍落度符合下列哪一种范围？（） A.大于10cm B.2～8cm C.

1. Does Peter have a basketball?
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2. Does Rose have a baseball?
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3. Does Tom have a soccer ball?
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4. Does Bill have a baseball bat?
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5. Does Ruby have a soccer ball?
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6. ________________________________________
   Yes, Bill likes baseball.
7.________________________________________ 
   No, Peter doesn't have a tennis racket.
8. ________________________________________ 
    No, Tom doesn't like basketball.
9. ________________________________________ 
     Yes, Ruby has a baseball bat.
10. _______________________________________ 
     Yes, Rose has a tennis racket.