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Read the text below to answer questions 16-20.

Background

The Naval Nuclear Propulsion Program (NNPP) started in

1948. Since that time, the NNPP has provided safe and effective

propulsion systems to power submarines, surface combatants,

and aircraft carriers. Today, nuclear propulsion enables virtually

undetectable US Navy submarines, including the sea-based leg

of the strategic triad, and provides essentially inexhaustible

propulsion power independent of forward logistical support to

both our submarines and aircraft carriers. Over forty percent of

the Navy's major combatant ships are nuclear-powered, and

because of their demonstrated safety and reliability, these ships

have access to seaports throughout the world. The NNPP has

consistently sought the best way to affordably meet Navy

requirements by evaluating, developing, and delivering a variety

of reactor types, fuel systems, and structural materials. The

Program has investigated many different fuel systems and

reactor design features, and has designed, built, and operated

over thirty different reactor designs in over twenty plant types to

employ the most promising of these developments in practical

applications. Improvements in naval reactor design have allowed

increased power and energy to keep pace with the operational

requirements of the modern nuclear fleet, while maintaining a

conservative design approach that ensures reliability and safety

to the crew, the public, and the environment. As just one

example of the progress that has been made, the earliest

reactor core designs in the NAUTILUS required refueling after

about two years while modern reactor cores can last the life of a

submarine, or over thirty years without refueling. These

improvements have been the result of prudent, conservative

engineering, backed by analysis, testing, and prototyping. The

NNPP was also a pioneer in developing basic technologies and

transferring technology to the civilian nuclear electric power

industry. For example, the Program demonstrated the feasibility

of commercial nuclear power generation in this country by

designing, constructing and operating the Shipping port Atomic

Power Station in Pennsylvania and showing the feasibility of a

thorium-based breeder reactor.

In: Report on Low Enriched Uranium for Naval Reactor Cores. Page 1.

Report to Congress, January 2014.

Office of Naval Reactors. US Dept. of Energy. DC 2058

http://fissilematerials.org/library/doe14.pdf

Read the passage taken of the text below.

“The Naval Nuclear Propulsion Program (NNPP) started in

1948.Since that time, the NNPP has provided safe and

effective propulsion systems to power submarines, surface

combatants, and aircraft carriers. Today, nuclear propulsion

enables virtually undetectable US Navy submarines, including

the sea-based leg of the strategic triad, and provides essentially

inexhaustible propulsion power independent of forward

logistical support to both our submarines and aircraft carriers."

Choose the alternative in which the words can properly

substitute the ones in bold and underlined, respectively.

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