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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单项选择题
People have different opinions about ______.
A．why the concentration of gas is rising steadily
B．to what degree the greenhouse effect can affect us
C．whether CO2 has anything to do with the greenhouse effect
D．what measures should be taken to lower the carbon dioxide levels
单项选择题
From the passage we may come to the conclusion that ______.
A．joining big companies are more beneficial to graduates
B．smaller companies are the best choice for graduates
C．graduates should listen to their parents' opinions when choosing a job
D．both big companies and small ones have their own advantages and disadvantages
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