单项选择题


Questions 14-16 are based on the following speech. You now have 15 seconds to read Questions 14- 16.
What is the most important factor for a dog’s survival

A．Sharp vision.
B．Acute hearing.
C．Keen sense of smell.
D．Legs.
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单项选择题
Special Olympics is organized for ______.
A．the mentally challenged athletes
B．children
C．university students
D．old people
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