单项选择题

The underlined word "colonies" in Paragraph 4 refers to______

A．tiny globules
B．watery regions
C．bacteria communities
D．little compartments
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单项选择题
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 butut
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
单项选择题
What does the author mean when he says, we can' t mm the clock back (the underlined clause in Para. 3)
A．It's impossible to slow down the pace of change.
B．The social reality children axe facing cannot be changed.
C．Lessons learned from the past should not be forgotten.
D．It's impossible to forget the past.
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