单项选择题

A．They are unconquerable obstacles.B．They do not exist.……

A．They are unconquerable obstacles.
B．They do not exist.
C．They are challenges to improve the city life.
D．They are exciting and interesting.

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单项选择题A．Step forward and speak to others.B．Look for the people who are also nervous.C．Draw back from the group and try to calm down.D．Take a deep breath and try to forget your nervousness.

A．Step forward and speak to others.
B．Look for the people who are also nervous.
C．Draw back from the group and try to calm down.
D．Take a deep breath and try to forget your nervousness.