The interviewee is believed to be a bank ______.

A. To obtain the material for useful tools.
B. To prepare the fields for cultivation.
C. To help in removing trees and bushes so that land could be cultivated.
D. To make many objects useful in everyday life.

A. New techniques are continually developed and new machines invented for undersea exploration.
B. If not well built, a submersible is most likely to get crushed in deep water.
C. A submersible, when manned, looks very like a spaceship.
D. In certain respects undersea exploration is often faced with the same problem as the space exploration.