Observations of cetaceans in the wild have provided some insights on their learning abilities. Several bottlenose dolphins off w

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问题 Observations of cetaceans in the wild have provided some insights on their learning abilities. Several bottlenose dolphins off western Australia, for instance, have been observed carrying large cone-shaped sponges over their beaks. They supposedly use the sponges for protection against stingrays and other hazards on the bottom as they search for fish to eat. This is the first record of the use of tools among wild cetaceans.
The word "hazards" in the passage is closest in meaning to

选项 A、objects
B、dangers
C、species
D、debris

答案B

解析

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托福（TOEFL）

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Observations of cetaceans in the wild have provided some insights on their learning abilities. Several bottlenose dolphins off w

托福（TOEFL）

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