【名词&注释】
微生物(microorganism)、蕨类植物(pteridophyte)、配子体(gametophyte)、原叶体(prothallus)
[单选题]一些菊科植物果实适应动物传播的特征是( )。
A. 冠毛
B. 刺毛或倒钩
C. 被黏液
D. 味美而吸引动物
查看答案&解析
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举一反三：
[单选题]what is good about the flat?
A. it has a large sitting room.
B. it has good furniture
C. ir has a big kitchen.
[单选题]CFood 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.
A. 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.
B. 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.
C. Some plants and animals contain natural poisons that are harmful to people. These include certain kinds of seafood, grains, nuts, seeds, beans, and mushrooms.
D. 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.
E. 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.
F. 51. Which of the following statements is NOT true?
G. Food when poisoned can make people sick.
H. Food poisoning means death.
I. Food poisoning comes in varieties.
J. Food poisoning can be serious.
[单选题]蕨类植物的配子体又称为( )。
A. 原丝体
B. 叶状体
C. 原叶体(prothallus)
D. 原植体
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