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.

<上一题目录下一题>

热门试题

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 a live Coelacanth.
C．The discovery of the fossils of lobsters.
D．The discovery of the fossils of sea urchins.

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