单选题:阅读短文,回答题:The significance of Brocklehurst's research is that

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阅读短文,回答题:

The significance of Brocklehurst's research is that __________
A.it suggested a way to keep some foods fresh without preservatives
B.it discovered tiny globules in both cream and butter  
C.it revealed the secret of how bacteria multiply in cream and butter
D.it found that cream and butter share the same chemical composition
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