单项选择题

What can we learn from this passage（）

A．Damages from fire and logging in the Amazon rainforest vary significantly from year to year.
B．The worsening of the global environment is chiefly due to deforestation.
C．It is a hard work to determine the accurate deforestation in the Brazil's Amazon region.
D．Farmers should be blamed for the worsening of the global environment.

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单项选择题

Which of the following was NOT done by the researchers in their study（）

A．Interviewing wood mill operators and landowners about logging.
B．Surveying fire damages from the airplane.
C．Measuring the actual wood harvest in selected parts of forest.
D．Surveying the damage of forest caused by Amazon floo

单项选择题

According to the author, the steel wires used to make barbed wire are specially processed to （）

A．make them more flexible
B．protect them against rust
C．straighten them
D．prevent contraction in cold weather