单项选择题

According to the study，when do babies feel the most comfortable

A．When they are with a baby-sitter.
B．When they are with another baby.
C．When they are with a strange adult.
D．When they are with an elderly person.
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单项选择题
What does the speaker say about“Black Friday”
A．It is the most unlucky day in a year.
B．It is the busiest shopping day now.
C．It is the day after Thanksgiving.
D．It is the day before Christmas.
单项选择题
What do we learn from the conversation about Chicago
A．Fort Dearborn was built in 1833 in the place that would become Chicago.
B．Chicago didn’t officially become a town in 1893.
C．Only 350 people lived in Chicago when it officially became a town.
D．Another 350 people moved into Chicago when it became a town.
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