单项选择题

Some linguists believe that the ______ age for children learning a foreign language is 5 to 8.

A．optimistic
B．optional
C．optimal
D．oppressed
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多项选择题
Which of the following is NOT mentioned as a factor shaping personality
A．Death of a parent.
B．Children’s language.
C．A natural disaster.
D．A fatal disease.
单项选择题
The Olympic Games were watched by ______ billions of people around the world.
A. virtually
B. literally C deliberately
D. appropriately
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