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
According to the researchers, cream sours faster than butter because bacteria ______
A．are mom evenly distributed in cream
B．multiply more easily in cream than in butter
C．live on less fat in cream than in butter
D．produce less waste in cream than in butter.
单项选择题
According to Brocklehurst, we can keep cream fresh by______
A．removing its fat
B．killing the
C．reducing its water content
D．altering its structure
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