The chemicals would form a (5) ____ layer around the Earth that would reflect sunlight and so cool the Earth, much like the effects of a volcanic eruption.

A. protecting 

A. able

A. by

A. absolutely

Remembering scientists’ pet theory about the dinosaurs (5) __________ out because of a huge volcanic eruption, we were lucky that humankind survived this time.

A. killing

A. urban

The other vital ingredient, though, was the completely natural fog, and who would have thought that could be (3) __________ ?

A. poisoned

A. heavy

A. plants

A. burn

A. burn

A forestry expert quoted by the Natural Resources Defense Council describes clear cutting as “an ecological trauma that has no precedent in nature (2) _____ for a major volcanic eruption.”

A. off 

What is the result of using chemicals in farming?

What nutrition do plants need from the soil?

What is NOT mentioned as a cause of water pollution?

What is affected by water pollution?

B. Only animals living in water

What is possibly the main factor that damages the ozone layer according to the passage?

What is NOT mentioned as a consequence of the increase in air pollution?

What is NOT mentioned as a cause of air pollution?

What is the passage mainly about?

B. Effects of pollution

What does the infertile soil result in?

What is true about ozone layer?

What is NOT mentioned as a disease caused by air pollution?

In the last paragraph, the author mentions a 21-gun salute as an example of _____.

Which of the following is NOT one of the components of the negative effects that noise pollution has on people?

Secondhand noise and secondhand smoke are similar in that _____.

The author of the passage implies that secondhand noise pollution ______.

The author explains the concept of interfering with others’ use and enjoyment of a common by ______.

What is the text about?