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
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单项选择题
Even though the evidence is overwhelming, if one juror is still skeptical, the case must be retried.
A．not present
B．not surprised
C．not convinced
D．not worried
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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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