单项选择题

Louis Brailele designed a form of communication enabling people to______ and preserve their thoughts by incorporating a series of dots which were read by the finger tips.

A．retain
B．visualize
C．convey
D．transfer
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单项选择题
Although Oriental ideas of woman' s ______to man prevailed in those days, she did dare to meet with man on equal basis.
A．contribution
B．sacrifice
C．subordination
D．obedience
单项选择题
The dairy industry has taken great pains to increase the number of products from which the butterfat has been______.
A．revived
B．removed
C．excluded
D．isolated
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