单项选择题

According to the passage ,the British granted the new American nation a western boundary acted

A．Ohio
B．Illinois
C．the Mississippi River
D．the Appalachian Mountains
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单项选择题
Which of the following consists of three words that refer exactly to the same thing in the passage
A．Climate, temperature, heat.
B．Carbon dioxide, the gas, atmosphere.
C．Output, production, effect.
D．Termites, critters, insects.
单项选择题
From the passage we know that the greenhouse effect is an effect in which ______.
A．low temperatures are created by using a house
B．the house is made green in order to keep heat
C．heat is prevented from escaping outside
D．everything is kept green in a house
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