单项选择题

The description of a language as it changes through time is a______ study.

A．prescriptive
B．descriptive
C．synchronic
D．diachronic
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单项选择题
Which is the most important crop in America
A．Corn.
B．Rice.
C．Barley.
D．Oat.
单项选择题
The capital of New Zealand is______.
A．Canberra
B．Melbourne
C．Wellington
D．Perth
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