A

The Portuguese man­o­war (ɮñˮĸ), commonly called the blue bottle in Australia, is another stinging jellyfish (ˮĸ)£®It is widely seen throughout the warmer seas of the world£¬especially in the Australian summer months in shallow, coastal waters. Besides, it is not uncommon to find thousands of Portuguese man­o­war floating in groups off the popular surfing beaches in Queensland£¬Australia.

Actually£¬the blue bottle is not a single sea animal£¬but consists a large colony of smaller marine organisms(ÓлúÌå)£®It is a large, gas­filled, bladder­like(µ¨×´Îï)blue float, which can be up to 30 centimeters in length and rise above the water as much as 15 centimeters. The float has a crest which is used much as a sail to push the colony across the water when the wind blows.

Groups of polyps are attached to the underside of the blue bladder£¬and very long tentacles(´¥ÊÖ) extend from each of the polyps. Each of the tentacles has stinging cells that are capable of killing fish up to 10 centimeters long. The poison from the stinging cells causes breathing problems and muscle weakness, and it is through these actions that the blue bottle catches and kills its victims.

Although the sting from the blue bottle is not as deadly to humans as the box jellyfish, a person who comes into contact with a blue bottle will still suffer a lot. The sting can cause serious side effects including fever, shock and breathing problems. The severe pain from the sting may last about two hours, and depending upon treatment, the pain will usually disappear in seven hours. The usual, quick but effective first aid treatment for the sting from a blue bottle is to pour vinegar over the area of the sting and over the tentacles, before removing the tentacles from the skin.

21£®How does the Portuguese man­o­war get its name blue bottle£¿____

A£®From the blue ocean it lives in.

B£®From the sea plants it feeds on.

C£®From the colour and shape of its body.

D£®From the polyps that are attached to it.

22£®Compared with box jellyfish, the blue bottle ____.

A£®doesn't like attacking human beings

B£®prefers to live in a colder environment

C£®can't be found off the beaches in Queensland

D£®is not as harmful to humans as box jellyfish

23£®If a man is stung by the blue bottle£¬he ____.

A£®will suffer from a sharp severe pain

B£®may stop breathing in seven hours

C£®can only go to the hospital to get treated

D£®should drink some vinegar to reduce pain

CDA