A．Switching off TV.

　　B．Riding bikes.

　　C．Using poisonous cleaners.

　　D．Saving electricity.

　　答案：C　细节理解题。根据文章倒数第三段的第二句“They include pledging (保证) to turn off the TV, give up the use of poisonous cleaners...”可知，答案C符合文义。

　　阅读理解, 从给的四个选项 (A、B、C和D) 中, 选出最佳选项。

　　Food sometimes gets poisoned with harmful things. A person who eats such food can get an illness called food poisoning. Food poisoning is usually not serious, but some types are deadly. The symptoms of food poisoning usually begin within hours of eating the poisoned food.Fever is one of the most common symptoms.

　　Certain microorganisms(微生物)cause most types of food poisoning. Bacteria and other microorganisms can poison eggs, meat, vegetables, and many other foods. After entering the body, these tiny living things release(释放)poisons that make people sick.

　　Some chemicals can also cause food poisoning. They are often added to food while it is being grown, processed, or prepared.For example, many farmers spray chemicals on crops to kill weeds and insects. Some people may have a bad reaction to those chemicals when they eat the crops.

　　Some plants and animals contain natural poisons that are harmful to people. These include certain kinds of seafood, grains, nuts, seeds, beans, and mushrooms.

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