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【单选题】

What invention made milk keep longer in 1851

A.
A special milk bottle.
B.
A method to take water out of milk.
C.
A way to kill bacteria in milk.
D.
Machines to fill bottles automatically.
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【单选题】What determined the interest on the loans

A.
The distance the merchandise had to be transported.
B.
The number of insurance companies available at the time.
C.
The risk involved in transporting the goods.
D.
The type of ships used to transport the goods.