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A. Loss of habitat.
B. Pollution.
C. Hunting.
D. Many more reasons.

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A. They feed lots of humans.
B. They have the life cycle.
C. They play an important role in the biological chain.
D. They will become extinct.

A. Decreasing bamboo forests.
B. People’s intrusion.
C. Industrialization.
D. Population growth.

A. They give birth to only one or two every year.
B. Only one baby survives after birth.
C. They carefully choose mates.
D. All the above.

A. They built natural areas.
B. They encouraged tourism.
C. They raised the price.
D. They asked for donations.