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

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单项选择题

Why did the U.S. Navy set up underwater microphones around the world in the 1960s

A．To listen for changes in ocean structure.
B．To listen for changes of ocean currents or volcanic activity.
C．To make sure whether there was a giant squid deep in the ocean.
D．To follow the track of the Soviet warships under water.

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.