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Stephen Hawking believes that the earth...

 Stephen Hawking believes that the earth is unlikely to be the only planet          life has develop gradually.

A. that                  B. where           C. which           D. whose

 

 答案B。 【解析】考查定语从句。句意为:“斯蒂芬·霍金认为地球是不可能是唯一的生命逐渐发展的星球。”where引导定语从句,相当于in which。  其余三项不符合先行词在定语从句中所作的成分,故排除。因此应选B项。
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A.                               B.

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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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Most people recover from food poisoning after a few days of resting and drinking extra water. If people eat natural poisons, they must go to the hospital right away to have their stomachs emptied.

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    D.different types of food should be handled differently

5.It can be inferred from the passage that        .     A.natural materials are safe in food processing

    B.chemicals are needed in food processing

    C.food poisoning can be kept under control

    D.food poisoning is out of control

 

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