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Jellyfish are a species of sea animal that are named because of their bodies.Despite the name，they are not fish.A jellyfish has no head，brain，heart，eyes，or ears.
Fossil evidence of these creatures dates back to over 650 million years ago，perhaps earlier than dinosaurs.With so many kinds of jellyfish floating about，there must be variety in the appearance of their body parts.However，the typical body is made up of the bell，the oral arms and the tentacles（觸手）.
The bell of the jellyfish is the smooth umbrella-shaped body that is designed to pump.Inside the bell are the mouth and stomach.The digestive system（消化系統(tǒng)） is very simple.The stomach，which can be considered the jellyfish's "inside"，is lined with cells.We can easily see their "inside" because water takes up the major part of their bodies，the percentage of which is over 95%.
The jellyfish has no brain，but it does have a simple nervous system called a nerve net，which spreads throughout the outside layer of the animal's skin.When the jellyfish comes in contact with potential danger，the cells of the nerve net respond by shooting out many tentacles.
Although the jellyfish does not have sensory organs，it does possess tiny simple sensory structures.Their special structures in the body can react to light.Thus the jellyfish，though lacking a brain and eyes，can respond to sunlight shining through the water.It should be noted that，although it can perceive light，without eyes it cannot see images.
Jellyfish，because of their stinging（蜇人的）tentacles，can be dangerous to humans.Of the more than 2，000 species，roughly 70 are thought to be potentially dangerous to humans.The stings of some of these can even be deadly to humans，and may leave permanent scars on any victim who is lucky enough to survive.
（1）What can be found in each jellyfish's body？CC
A．Head.
B．Heart.
C．A digestive system.
D．Sensory organs.
（2）Why can the "inside" of jellyfish be easily seen？CC
A．Their bodies are umbrella-shaped.
B．They have fewer cells.
C．Their bodies mainly consist of water.
D．They have very thin skin.
（3）The underlined word "perceive" in Paragraph 5 is closest in meaning to "BB".
A．a(chǎn)bsorb
B．sense
C．recognize
D．judge
（4）What can be inferred from the passage？CC
A．Jellyfish's digestive system is complex.
B．Jellyfish share the same body appearance.
C．Jellyfish protect themselves with their tentacles.
D．Jellyfish's attack makes people die immediately.
【考點(diǎn)】說明文．
【答案】C；C；B；C
【解答】
【點(diǎn)評(píng)】
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發(fā)布：2024/5/23 20:38:36組卷：8引用：2難度：0.5
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D．Man can't live without natural areas.發(fā)布：2025/1/6 16:30:6組卷：0引用：1難度：0.5
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