单项选择题

What will be the result of the greenhouse effect

A．The earth's temperature will change irregularly.
B．The amount of carbon dioxide will be reduced.
C．The global temperature will gradually increase.
D．Much more sunlight will be blocked by CO2.
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单项选择题
What is the specific feature of fossil fuels
A．They are colorless.
B．They are odorless.
C．They are rich in carbon.
D．They are easy to freeze.
单项选择题
Carbon dioxide is now a threat to ______.
A．people staying indoors
B．people in poor health
C．the earth's vegetation
D．the earth's temperature
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