单项选择题


Questions 17 to 20 are based on the following biographies for the presidential candidates in US 2008. You now have 20 seconds to read Questions 17 to 20.
Who served as ambassador to the United Nations

A．Barack Obama.
B．Mitt Romney.
C．Bill Richardson.
D．John McCain.
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单项选择题
Most of marathoners take part in the race to
A．win cash prizes.
B．attract audience.
C．achieve success.
D．win an oliye-branch-woven wreath.
填空题
D
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