单项选择题

Behavior problems of dogs are believed to______.

A．be just part of their nature
B．worsen in modem society
C．occur when they go wild
D．present a threat to the community
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单项选择题
An effective way to prevent the burnout of young athletes is______.
A．to make sports less competitive
B．to make sports more challenging
C．to reduce their stress
D．to increase their sense of success
单项选择题
According to the passage sport is positive for young people in that______.
A．it can help them learn more about society
B．it teaches them how to set realistic goals for themselves
C．it enables them to find flaws in themselves
D．it can provide them with valuable experiences
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