4 Read this passage from "Alcatraz Island" by the National Park Service. What is the implied main idea?
The US government operates federal prisons to hold people convicted of violating federal laws. Alcatraz housed some of America's most notorious
offenders from 1934 to 1963. They were held under the most secure and regimented conditions, in the virtually escape-proof environment on a rocky
island in the middle of San Francisco Bay. As the highest security prison, Alcatraz kept its inmates under the tightest controls. Inmates were housed
one man to a cell. Two person cells, four-person cells, and open dormitories were common in other federal prisons. Inmates at other prisons spent
most of their days out of their cells at mandatory work programs, educational classes, and recreational activities.
The US government has many federal prisons.
Alcatraz was America's most famous federal prison
Prisoners were kept in isolation at Alcatraz.

the correct answer is d

the term is einsatzgruppen

it was displayed because they had a love for war

in the united states, the president is controlled by the

constitution, and in all respects subordinate to it. insofar

as it deals with presidential power, however, the american

constitution has proved to be a highly malleable document.

with very few exceptions,' the constitutional provisions relating to the president have not been changed at all since

they were ratified in 1787. but in the late twentieth century, those provisions do not mean what they meant in

1787. the constitution is a legal document, and it is enforced judicially; but its meaning was hardly fixed when it

was ratified. in particular, the contemporary president has

far broader powers than the original constitution contemplated. it is remarkable but true that large-scale changes in

the authority of the president have been brought about

without changes in the constitutional text, but nevertheless

without significant illegality.

this is a paradox. is it not clear that constitutional

changes, if not textual, are illegal? the paradox has considerable relevance to our current thinking about the presidency in particular and about constitutionalism in general.

perhaps the framers of the american constitution feared

legislative power most of all; 2 but from well-known events

in the twentieth century, it is possible to conclude that it is

presidential power that holds out the greatest risks to both

liberty and democracy. the president is by far the most visible leader in the nation; he is often the only person in government with a national constituency. moreover, he is