单项选择题

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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Information About the Dialogue Eric is from ______ part of the US. (1) It takes ______ minutes to drive from the Texas border to his hometown. (2) Eric thinks southerners are more ______ than people from the north. (3) Mark thinks people in ______ countries tend to have a laid-back relaxed helpful friendly sort of attitude. (4) Where is Mark In a big ______. (5)
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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