4-We are informed by the author that modern submarines …….. .
A) are commonly known as U-boats, as Germans call them
B) are not as dangerous as the ones run on nuclear energy
C) are even faster than the fastest ships on the surface
D) don't need very large crews because of advanced technology
E) are capable of remaining underwater for extended periods
5- According to the passage, until World War I,........ .
A)the principles of building a submarine was unknown outside of the USA B) the use of submarines
was limited
C) there were no submarines operating efficiently
D) merchant ships were at risk during war times
E) Germans had failed to have any victories at sea
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