Food sometimes gets poisoned with harmfu

题型:阅读理解

问题:

Food sometimes gets poisoned with harmful things. A person who eats such food can get an illness called food poisoning(中毒). 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.

When people handle food properly, the risk of food poisoning is very small. Microorganisms multiply rapidly in dirty places and in warm temperatures. This means that people should never touch food with dirty hands or put food on unwashed surfaces. Food should be kept in a refrigerator to stop microorganisms from growing. Meat needs to be cooked thoroughly to kill any dangerous microorganisms. People should also wash food covered with chemicals before eating it. Finally, people should not eat wild mushrooms or other foods that grow in the wild. Some of these foods may contain natural materials that are poisonous to humans. In addition, some types of fish can be poisonous.

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.

小题1:Which of the following statements is NOT true?

A.Food when poisoned can make people sick.

B.Food poisoning means death.

C.Food poisoning comes in varieties.

D.Food poisoning can be serious.小题2:We know from the passage that the symptoms of food poisoning        .

A.are always accompanied by a fever

B.are too common to be noted

C.can be noticed within hours

D.can he ignored小题3:Food poisoning can be caused by all the following EXCEPT       .

A.some chemicals

B.low temperatures

C.some tiny living things

D.certain natural materials小题4:From Paragraph 5,we can learn that        .

A.mushrooms should not be eaten

B.vegetables are safer than meat and seafood

C.natural poisons are more dangerous than chemicals

D.different types of food should be handled differently小题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

考点:健康环保类阅读
题型:阅读理解

江流域,位于黑龙江省三江平原内,学者对其湿地景观的多样性、景观优势度等方面的变化动态进行了研究。景观多样性的大小反映景观类型的多少和各景观类型所占比例的变化。景观优势度越高,表明组成景观各类型所占比例差异越大,也即一种或几种少数景观类型占优势。读“1954年-2005年浓江流域湿地景观变化动态”图,回答6-8题

6.从1954年到2005年,浓江流域湿地的   

A.景观优势度呈上升趋势       

B.景观优势度呈下降趋势

C.景观多样性呈增加趋势       

D.各类湿地景观类型面积都变大

7.近20年来,影响浓江流域景观多样性和景观优势度变化的主要原因是    

A.气温变暖                     B.人类开垦      

C.降水增多                     D.地壳抬升

8.图表中浓江流域的某些变化还会影响到生物多样性的保护、水土的保持和经济的持续发展。这充分体现了自然地理环境的

A.生产性                       B.平衡性        C.差异性                       D.整体性

题型:阅读理解

企业管理软的一手是()

A.科学管理

B.人事科学管理

C.形为科学管理

D.绩效科学管理

题型:阅读理解

人们文化素养的核心和标志是

①世界观     ②人生观     ③价值观    ④发展观

①②      B.③④         C.①②③        D.①②③④

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下列关于SNMP协议中Trap报文描述正确的是()。

A.Trap报文使用UDP进行传送,端口号为162

B.Trap报文使用UDP进行传送,端口号为161

C.Trap报文使用TCP进行传送,端口号为161

D.Trap报文使用TCP进行传送,端口号为162

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ADSL系统中最严重的一种干扰是()。

A、自近端干扰

B、近端干扰

C、远端干扰

D、电磁干扰

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