单项选择题

According to the study, an infant child can form friendship as young as______.

A．six months old.
B．one year old.
C．eighteen months old.
D．two years old.
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单项选择题
If the woman wants to go up the hill, what should she do
A．She should keep leaning forward.
B．She should cross.
C．She should go step by step like a crab.
D．She should point the tips together.
单项选择题
According to the schedule, the students will take the trip for ______ hours.
A．6
B．7
C．8
D．9
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