填空题

Global warming, the depletion of the ozone layer in the atmosphere, and destruction of the world’s rain forests have made up of all the environmental problems.

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N
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单项选择题
Human babies are born in immature, helpless states, owing to ______.
A．the early birth of human fetuses
B．the big brains of the fetus
C．the constricted birth canals of the mother
D．both big brains and constricted birth canals
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