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单项选择题

The study of the rules whereby words or other elements of sentence structure are combined to form grammatical sentences is______.

A．syntax
B．semantics
C．morphology
D．sociolinguistics
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单项选择题Who was the US President during World War Ⅱ

A．DwightD. Eisenhower
B．JohnF. Kennedy
C．Franklin
D．Roosevelt.D. Theodore Roosevelt