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  3. Jellyfish 【B1】______They look like jelly, bu

Jellyfish 【B1】______They look like jelly, bu

游客2023-10-20  21
问题                                 Jellyfish
    【B1】______They look like jelly, but of course they aren’t. And they certainly aren’t fish. So, what exactly are these strange creatures?
    【B2】______Jellyfish consist of over 95% water. They have no head, brain, heart, eyes, ears or bones! They have a kind of body, called a "bell". The bell is the big round part that looks like jelly. Inside it are nerves, which are all jellyfish needs to move to sense light.
    【B3】______When jellyfish find their food, these tentacles can shoot out poison to kill it. Underneath the bell is a mouth.
    【B4】______There are over 2, 000 species, and new ones are still being found. They vary greatly in appearance and size, from ones as small as a coin to ones with bells over 2 meters across and tentacles 60 meters long.
    【B5】______The box jellyfish, which lives in the seas off Northern Australia and Indonesia, is so poisonous that it can kill a human being in just a few minutes. Not only that, its poison is so painful that it usually causes people to drown before they can swim back to the shore. It’s not surprising that it has the title of "the most dangerous creature in the world" ! But don’t worry. Most jellyfish are harmless. And the dangerous ones are usually found deep in the ocean, living their mysterious lives far away from humans.
Fill in each blank with one of the following statements, two of which are useless. Put the letters A, B, C, D, E, F or G in each blank according to the theme development.
A. Jellyfish also vary in how dangerous they are.
B. Jellyfish aren’t named very well.
C. Mammals are warm-blooded and breathe air through lungs.
D. What do they have?
E. Jellyfish, which have been in the Earth’s oceans for over 600 million years(before dinosaurs), are not all the same.
F. Another important part is the tentacles, the long strings hanging from the bell.
G. Have you ever wondered what the largest fish in the sea is? [br] 【B5】
选项
答案 A
解析 最后一段首先讲述了有剧毒的箱型水母(box jellyfish)，随后该段倒数第二句又提到“大多数水母都不会对人造成伤害”，A项“水母在其危险程度上也有很大不同”起到总领该段的作用。
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