单项选择题

What must the explorers be, even though they have modem equipment and technique

A．Brave and tough.
B．Stubborn and arrogant.
C．Well-liked and humorous.
D．Stout and smart.
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单项选择题
The most healthy climate in the world is ______.
A．in South America
B．in the Arctic Region
C．in the Antarctic Continent
D．in the Atlantic Ocean
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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