单项选择题

Why does the author mention Colonel Clark's expedition

A．To explain how one state strengthened its land claims.
B．To criticize an effort to acquire additional agricultural resources.
C．To show that many explorers searched for new lands.
D．To question the validity of Virginia's claims.
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单项选择题
Which of the following statements is NOT true
A．It is the production by termites that is now of greater concern.
B．What scientists worry more about is the output from burning fuels.
C．The output from burning fuels is now rising steadily.
D．The burning of fuels generates much less carbon dioxide than termites do.
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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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