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A drug is a chemical substance.

出自-2015年12月听力原文

The supervisor of the laboratory is beginning to get headaches and dizzy spells because she says it's dangerous to breathe some of the chemical smoke there.

出自-2011年6月听力原文

Muscle performance can also be affected by a phenomenon called "central fatigue", in which an imbalance in the body's chemical messengers prevents the central nervous system from directing muscle movements effectively.

2017年6月四级真题（第三套）阅读 Section A

It will drive producers of chemical fertilizers out of business.

出自-2016年6月阅读原文

In cases where sewage mud is used, expensive chemical fertilizer use can be avoided.

出自-2016年6月阅读原文

Way up north in the Canadian Arctic, seabirds are picking up dangerous chemicals in the ocean and delivering them to ponds near where the birds live.

出自-2016年12月听力原文

The bodies of fish and other meat eaters can build up high levels of the chemicals.

出自-2016年12月听力原文

Salmon also carry dangerous chemicals as the fish migrate between rivers and the sea.

出自-2016年12月听力原文

People who live, hunt or fish near bird coloniesneed to be careful, the researchers say, The birds don’t mean to cause harm, but the chemicals they carry can cause major problems.

出自-2016年12月听力原文

We can tear apart the great grass cover of the western plains and pour toxic chemicals into the soil until the soil is dead and blows away in the wind.

出自-2013年12月听力原文

Chemical testing showed that over the two years before her death, she moved about every two months.

2015年12月六级真题（第二套）听力 Section C

Heating this chemical compound drives off carbon dioxide gas, leaving calcium oxide.

2018年12月六级真题（第二套）听力 Section C

The chemical composition of rainfall changes slightly as rain clouds move.

2015年12月六级真题（第二套）听力 Section C

The method relies on measuring how chemical variations in drinking water show up in people's hair.

2015年12月六级真题（第二套）听力 Section C

Although we may not be aware of chemicals like pheromones consciously, we give and receive loads of information through smell in every interaction with other people.

2015年高考英语上海卷 完形填空 原文

But she expects using the chemical in some kind of industrial process-not simply "millions of worms thrown on top of the plastic".

2018年高考英语北京卷 阅读理解 阅读C 原文

Changing levels of body chemicals called hormones not only make teenagers' bodies develop adult characteristics, but also make it hard for teenagers to fall asleep before 11 pm.

2017年高考英语浙江卷（6月） 阅读理解 阅读B 原文

Her popular 1962 book Silent Spring raised awareness of the dangers of pollution and the harmful effects of chemicals on humans and on the world's lakes and oceans.

2016年高考英语全国卷1 阅读理解 阅读A 原文

Hormones are chemicals which are produced by the body to control various body functions.

2016年高考英语四川卷 阅读理解 七选五 原文

In contrast, humans do not seem to be as gifted as other animals at detecting such chemicals.

2015年高考英语上海卷 完形填空 原文

In study after study, it appears that these chemical conversations help the neighbors.

2017年高考英语全国卷2 阅读理解 阅读D 原文

Many animals give off pheromones — natural chemicals that can be detected by, and then can produce a response in, other animals of the same species.

2015年高考英语上海卷 完形填空 原文

Other experts say part of the problem is chemical.

2017年高考英语浙江卷（6月） 阅读理解 阅读B 原文

So condors with high levels of lead are sent to Los Angeles zoo, where they are treated with calcium edta, a chemical that removes lead from the blood over several days.

2016年高考英语北京卷 阅读理解 阅读C 原文

Some plants pump out smelly chemicals to keep insects away.

2017年高考英语全国卷2 阅读理解 阅读D 原文

These chemicals come from the injured parts of the plant and seem to be an alarm.

2017年高考英语全国卷2 阅读理解 阅读D 原文

They are affected by certain body chemicals.

2017年高考英语浙江卷（6月） 阅读理解 阅读B 选项

What the plants pump through the air is a mixture of chemicals known as volatile organic compounds, vocs for short.

2017年高考英语全国卷2 阅读理解 阅读D 原文

Where we use sound and sight to communicate, ants depend primarily on pheromone, chemicals sent out by individuals and smelled or tasted by fellow members of their colony.

2015年高考英语安徽卷 阅读理解 阅读D 原文

95 knit miniskirt in all its 2,300-pius stores around the world, it must rely on low-wage overseas labor, order in volumes that strain natural resources, and use massive amounts of harmful chemicals.

出自-2013年考研阅读原文