单项选择题

This passage is ______.

A．an editorial response to a letter
B．a newspaper article
C．a letter in response to a letter
D．a newspaper editorial
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单项选择题
What kind of metals and minerals can we find in the Antarctic
A．Magnesite, coal and oil.
B．Copper, coal and uranium.
C．Silver, natural gas and uranium.
D．Aluminum, copper and natural gas.
单项选择题
When did man begin to explore the Antarctic
A．About 100 years ago.
B．In this century.
C．At the beginning of the 19th century.
D．In 1798.
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