[单项选择]False Fear of Big Fish Many people believe sharks(鲨鱼)are dangerous and will always try to hurt or even killhumans． (46) A shark exhibition at the National Aquarium(水族馆)in Baltimore，US，proves this． Visitors can touch young sharks．see their eggs develop and watch a dozen different species swim smoothly around a huge tank． Most people fail to realize that shark attacks don’t happen very often．Humans are mote likely to be killed by lightning than by a shark． (47)There，kids Call learn，from an early age，not to fear sharks． ‘’People fear what they don’t know，”said Nancy Hotchkiss。an organizer of the exhibition．“Sharks have been around for 400 million years and play 1til important role in the ocean’s foodchain．We want people to discover that sharks are amazing animals that need our respect andprotection．” __ (48)A study ,published in January in the US magazine，Science，found that almost all recorded shark species have fallen by half in the past eight to 15 years．

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[单项选择]False Fear of Big Fish Many people believe sharks(鲨鱼)are dangerous and will always try to hurt or even killhumans．______ (46) A shark exhibition at the National Aquarium(水族馆)in Baltimore，US，proves this． Visitors can touch young sharks．see their eggs develop and watch a dozen different species swim smoothly around a huge tank． Most people fail to realize that shark attacks don’t happen very often．Humans are mote likely to be killed by lightning than by a shark．______ (47)There，kids Call learn，from an early age，not to fear sharks． ‘’People fear what they don’t know，”said Nancy Hotchkiss。an organizer of the exhibition．“Sharks have been around for 400 million years and play 1til important role in the ocean’s foodchain．We want people to discover that sharks are amazing animals that need our respect andprotection．” ______ (48)A study ,published in January in the US magazine，Science，found that almost all recorded shark species have fallen by half in the past eight to 15 years．

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[单项选择]Many sharks （　） fish and other sea animals.
A. live with
B. depend in
C. feed on
D. eat at

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[单项选择]

{{B}}Sharks{{/B}}
Sharks are amazing fish that have been around since long before the dinosaurs existed. They live in waters all over the world, in every ocean, and even in some rivers and lakes.
{{B}}Sharks and bony fish{{/B}}
Unlike bony fish, sharks have no bones; their skeleton is made of cartilage (软骨), which is a tough, fibrous substance, not nearly as hard as bone. Cartilage, a strong fibrous (纤维的) substance, is softer than bone; our nose and ears are made of cartilage. Sharks also have no swim bladder (unlike bony fish).
{{B}}Size{{/B}}
There are many different species of sharks that range in size from the size of a person’s hand to bigger than a bus. The Whale shark is the largest fish in the world; the basking shark is the second largest fish. Fully-grown sharks
A. Because human being is their favorite food.
B. Because they may wildly attack anything in the area.
C. Because they swims in shallow waters where people swim.
D. Because they are very aggressive sharks.

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