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Turner's main argument in the significance of the frontier in American history was that the frontier was significant
a. in developing a relationship with American Indians
b. in explaining the flow of immigration
c. in American history
d. in European colonization

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i think it's either 'to expose the corruption of the communists in russia', or 'to criticize animal brutality by communists in russia.'  

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the gas pressure p, gas volume v, and gas temperature t are given in the formula:   pv=nrt,

r is the gas constant, and n is the number of gas moles.

if the container is cooled and remains under atmospheric pressure, where r is a constant that does not change, the volume of the container remains the same, the conclusion is drawn that, with all other values ​​unchanged, the number of gas moles n, is decreases.

the right answer is a.