单项选择题

With which of the following topics is the passage primarily concerned

A．A controversial public-land policy.
B．How independence from Britain was won.
C．The land holdings of Massachusetts.
D．How New Jersey developed its western land.

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单项选择题

Which state laid claim to the largest lan&holdings

A．North Carolina.
B．South Carolina.
C．Virginia.
D．Gorgia.

单项选择题

Which of the following sentences is true

A．Carbon dioxide in the atmosphere carries heat into outer space so as to change the climate.
B．Carbon dioxide may escape into the greenhouse so that the Earth will be made warmer.
C．As carbon dioxide keeps heat from escaping into outer space, the Earth may become warmer.
D．Carbon dioxide may make the Earth warmer because it lets the heat escape into outer space.