单项选择题

The rock music made popular by the Beatles has been modified over the past two decades.

A．improved
B．changed
C．discovered
D．remembered
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单项选择题
Difference in position adopted by oxygen and hydrogen atoms account for variations in the crystalline structure of different forms of ice.
A．are caused by
B．explain
C．derive form
D．constitute
单项选择题
A balance of international payment refers to the net result of the business which a nation carries on with other nations in a given period.
A．cancels
B．appropriates
C．transacts
D．mediates
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