答题训练

According to World Health Organization, how many people are killed by outdoor air pollution?

Land can be polluted by ________ from agriculture.

What kind of animal affected by man-made chemicals is not referred in the passage?

What do local residents claim for?

The pesticide DDT can be effective against ________.

There is a U.N. convention that can cover ________.

What is not said to be a way of cleaning up after ourselves?

From the passage we can infer taboo is ________.

Based on the ideas presented in the passage we can conclude "being fat" ________ in American society.

____he thought of it,the stars seemed always large and clear before the dawn of Christmas Day.