According to the passage, _____ is the biggest threat to coral reefs.
A. pollution
B. overfishing
C. industrial activity
D. climate change
A. pollution
B. overfishing
C. industrial activity
D. climate change
【答案】
A. pollution
B. overfishing
C. industrial activity
D. climate change
A. pollution
B. overfishing
C. industrial activity
D. climate change
【答案】
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