单项选择题

According to the author, babies learn to do things which ______.

A．will lead to some rewards
B．will meet their physical needs
C．will bring them a feeling of success
D．will satisfy their curiosity
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单项选择题
If we don't take immediate actions, pandas are likely to become extinct in ______.
A．3 to5 years
B．1 year
C．25 years
D．2years
单项选择题
The word groundbreaking ( paragraph 7 ) can be interpreted as ______.
A．pioneering
B．essentially new
C．epoch - making
D．evolutionary
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