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.

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单项选择题

The following is commonly known EXCEPT ________.

A．Megalodon, the largest shark, is extinct
B．Megalodon is not extinct but just out of reach
C．Megalodon was 52 feet long and had a jaw 7 or more feet wide
D．Megalodnn lived between several million years ago

单项选择题

What was special in their recorded sounds[A] A strange, powerful animal sound was heard. [C] A sea monster's sound was heard.[B] A big whale's sound was heard. [D] A giant squid's sound was heard.

A．What was special in their recorded sounds
B．A strange, powerful animal sound was heard.
C．A big whale's sound was heard.
D．A sea monster's sound was heard.
E．A giant squid's sound was heard.