单项选择题

He does a bit of writing, but first and ______ he's a teacher.

A．primary
B．foremost
C．principal
D．dominant
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单项选择题
You have to finish the work within the ______ time.
A．expected
B．supposed
C．disposed
D．assumed
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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