An underwater robot that can hear the calls of whales, and to help ships to avoid them, has just been successfully tested in the Bahamas.
The scheme relies on a fish-shaped glider that moves freely through the ocean. It can dive down as far as 200 meters below the surface and direct itself by shifting a weight from fore to aft. A microphone attached to the bottom of the glider can pick up calls from all whales, including the high frequency call of the beaked whale, which until now has been difficult to detect. The glider returns periodically to the surface to radio its data back to base, or if that's too far away, it can call a satellite phone and send its information anywhere in the world.
"We are entering a new era of underwater sensing' says Jim Theriault of Defence Research and Development Canada, in Dartmouth, Nova Scotia who ran the trial. "We can put a glider in the Bahamas and monitor it in Nova Scotia. ”
The hope is that naval or other ocean-going operations that use sonar (声呐）will be able to more easily track where whales are, and so avoid using their noisy equipment when they are close by. There is circumstantial evidence that sonar can upset whales and a number of strandings (搁浅）have been seen shortly after naval sonar operations. “We're trying to lower the potential risk by knowing the animals are there，” says Theriault.
The shape of the underwater robot is like __________

A．a man

B．a fish

C．a snake

D．a turtle

The underwater robot is built to __________.

A．help whales move to the Bahamas

B．help whales give birth to their young

C．help ships avoid whales

D．help humans kill more whales

To radio its data back to base, the robot has to __________

A．dive down as far as 200 meters below the surface

B．stay deep in the water

C．call a satellite phone

D．come to the surface periodically

The best title for this passage is “ __________ ”.

A．Whales are in danger

B．Whales are difficult to find

C．Robot built to kill whales

D．Robot built to spy on whales

Which of the following statements is FALSE?

A．Whales can be disturbed by naval sonar operations.

B．Whales can be disturbed by noisy equipment.

C．Whales can be disturbed by noisy ocean-going operations.

D．Whales' strandings have nothing to do with naval sonar operations.