单项选择题

What makes scientists doubt about the belief that Megalodon is extinct

A．The discovery of many "Living Fossils".
B．The discovery of the fossils of lobsters.
C．The discovery of a live Coelacanth.
D．The discovery of the fossils of sea urchins.

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单项选择题

What was special in their recorded sounds

A．A strange, powerful animal sound was heard.
B．A big whale's sound was heard.
C．A sea monster's sound was heard.
D．A giant squid's sound was heard.

单项选择题

What can be concluded from the passage

A．Scientists' discoveries always change people's belief.
B．There are too many secrets to be discovered.
C．Megalodon may be still alive deep in the ocean.
D．"Deep sound channel" allows sound waves to travel undisturbed.