单项选择题

Which of the following is NOT the reason for the greenhouse effect（）

A．Uncontrolled development.
B．A warming atmosphere at a global level.
C．Sunlight reaches the forest floor, dries plants and lights fires.
D．No limits on logging and bad fire preventing efforts.

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单项选择题

This passage mainly tells us（）

A．past efforts to estimate deforestation in the Amazon have completely failed
B．that damages caused by logging and fires threaten the Amazon rain forest
C．Amazon rainforest disappears faster than thought
D．that satellite images are made use of for estimating deforestation

单项选择题

What cannot be concluded about the satellite images（）

A．Satellite images are useless for calculating forest loss.
B．Satellite images cannot detect forest loss by selective logging.
C．Satellite images were not accurate because of changing environmental factors.
D．Satellite images showed half or less of the actual deforestation in Brazilian Amazon.