题目内容：

    Fireworks have been enjoyed by countless people ever since they were invented in China during the Tang Dynasty hundreds of years ago. From small family gatherings (团聚) to huge global celebrations, there isn’t a party that couldn’t be made more fun with a few fireworks. But it seems that there’s a big price to pay for some brief beauty and fun.

It’s been discovered that fireworks contain metals such as copper (铜) and lead, in addition to other pollutants like perchlorates (高氯酸盐). According to the Environmental Protection Agency, perchlorates can form naturally or be made. They are an industrial chemical used in rocket fuel and explosives (炸药), and are soluble (可溶解的) in water.

This is a reason for concern because perchlorates negatively affect the thyroid gland (甲状腺), which influences important bodily functions like blood pressure and heart rate.

Furthermore, a study conducted by Terry Gordon, a professor at New York University, examined the emissions(排放物) whose sizes were big enough to enter the lungs. They concluded that these emissions may lead to various dangerous conditions like cancer, heart attacks, and strokes (中风).

It is worth noticing, however, that no studies have proven the connctions between these conditions and the dangerous chemicals in fireworks.

However, the negative effects of firework emissions can be observed in birds. Britain’s Royal Society for the Protection of Birds warns against setting off fireworks close to wildlife areas as they may cause confusion among birds.

In 2010, an incident involving 5,000 red-winged blackbirds falling out of the sky on New Year’s Eve in Arkansas, US supported this idea. A fireworks display held at a nesting ground for blackbirds led to the birds’ night sight being affected, causing them to fall to their deaths.

Arguably (可以说), the use of fireworks during celebrations may be because people don’t realize how they pollute our environment. Companies and researchers could take this cue (线索) and find other new, eco-friendly ways.

After all, for all the beauty fireworks bring, there’s no better beauty than that of our planet’s.

1.According to the article, perchlorates contained in fireworks ______.

A.do harm to the thyroid gland

B.raise the risk of cancer

C.are dangerous when put in water

D.are made from copper and lead

2.Terry Gordon concluded from his research that ______.

A.fireworks are directly connected with lung cancer

B.the waste from fireworks could threaten our body

C.chemicals in fireworks could increase our blood pressure

D.our body is strong enough to fight against the pollutants in fireworks

3.What is the author’s attitude toward the use of fireworks?

A.Positive. B.Negative.

C.Indifferent. D.Neutral.