According to the researchers, cream sours faster than butter because bacteria __________

A．are more 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

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参考答案

依据是文章第3段相关内容。

1 According to Brocklehurst, we can keep cream fresh by__________

A．removing its fat

B．killing the bacteria

C．reducing its water content

D．altering its structure

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2 The word "colonies"(Line 2, Para.3) refers to__________

A．tiny globules

B．watery regions

C．bacteria communities

D．little compartments

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3 Commercial application of the research finding will be possible if salad cream can be made resistant to bacterial attack__________

A．by varying its chemical composition

B．by turning it into a solid lump

C．while keeping its structure unchanged

D．while retaining its liquid form

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