1. (2019八下·台州期中) 阅读下面的材料，然后从各题所给的四个选项中选出一个最佳答案。

    Have you ever paid attention to the Air Quality Index (空气质量指标) or AQI reported in the newspaper? The AQI helps us understand what the air quality around us means to our health. The AQI uses colors, numbers and words to tell us about the air. Let's see what these colors and numbers mean.

Colors	Numbers	Health word(s)	What to do
Green	0-50	Good	Just enjoy the clean air!
Yellow	51-100	Moderate (适中)	Air quality is fine for most people.
Orange	101-150	Unhealthy for sensitive groups	Active children and adults with lung(肺) disease should spend less time outdoors.
Red	151-200	Unhealthy	People with lung disease and active kids and adults shouldn't spend too long time outdoors. Everybody else should try to spend less time outside.
Purple	201-300	Very unhealthy	People with lung disease and active kids and adults should not spend any time outdoors. Everybody should try not to go outside.

1. （1） If the Air Quality Index is ________, the air quality is good for most people.

   A . orange B . red C . purple D . yellow
3. （2） The ________ AQI numbers are, the ________ air quality is.

   A . bigger; better B . bigger; nicer C . smaller; better D . smaller; worse
5. （3） Which of the following is TRUE?

   A . If the AQI number is 140, the AQI color will be red. B . If the AQI color is purple the air is the best for people. C . People with lung disease are very sensitive to the air. D . The AQI can't help people know the air quality.