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
Why is more earth's heat blocked from escaping with more carbon dioxide in the atmosphere
A．Carbon dioxide prevents the sun's energy from going back into space.
B．Carbon dioxide radiates the sun's energy onto the earth.
C．Carbon dioxide produces more heat in the atmosphere.
D．Carbon dioxide takes in the sun's energy at infra-red wavelengths.
单项选择题
In Chaisinthop's opinion, when working in a big company, one can ______.
A．get more experience in more areas
B．become more skilled with hardware
C．come to know 50 to 60 people easily
D．have opportunities to do bigger projects
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