单项选择题


A．moreover
B．however
C．still
D．yet
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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
Commercial application of the research finding will be possible ff salad cream can be made resistant tobacterial 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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