On the western tip of Australia，there is a place named Shark Bay.At least 28 kinds of sharks are swimming through the clear waters there—the largest in the world.Tiger sharks especially are common visitors to Shark Bay.They move their 15-foot-long （4.5 metres） bodies through the seagrass，sometimes catching huge sea cows for a meal.Although tiger sharks are dangers to them， they are important to the health of the ocean ecosystem.In fact，they could also be our powerful friends in stopping climate change.
It all comes back to the seagrass that moves with the waves in Shark Bay.This seagrass is food for the sea cows，which each eat about 40 kilograms （88 l b） of seagrass a day.By controlling the sea cow population，tiger sharks in Shark Bay help the seagrass beds grow.A good seagrass bed stores twice as much CO2 per square mile as forests do on land.
But globally，tiger shark numbers are becoming smaller，including some populations in Australia.Off Australia's north-east coast of Queensland，it is said that tiger sharks have fallen by at least 71%，largely because of overfishing and by catch（誤捕）.A reduction in tiger sharks means more seagrass eaten and less carbon stored in the ocean.
In Shark Bay，the tiger sharks were able to achieve the balance by keeping sea cow numbers down，and not all the bay's seagrass was lost.But here comes the question：What if sharks disappeared from the bay？The need to understand how they support their ecosystems becomes even more urgent（緊迫的）.
（1）What can we know from Paragraph 1？ AA
A．Tiger sharks eat sea cows.
B．The tiger shark is the largest of its kind.
C．The seagrass bed is about 4.5 metres long.
D．Sea cows are harmful to the ocean ecosystem.
（2）What does the underlined word "they" refer to in Paragraph1？ CC
A．Visitors.
B．Sea cows.
C．Tiger sharks.
D．Tiger sharks' bodies.
（3）How much seagrass can two sea cows eat a day？ DD
A．20 kg.
B．40 kg.
C．60 kg.
D．80 kg.
（4）What's the global situation of tiger sharks？ CC
A．They are overfishing sea cows.
B．They are moving out of Australia.
C．Their population is becoming smaller.
D．Their living condition is becoming worse.
（5）What's the main idea of the last paragraph？ DD
A．Climate change may be worse.
B．Sharks are very important to ecosystems.
C．There will be more sea cows in the future.
D．Human beings shouldn't hunt too many sharks.
【考點(diǎn)】說明文；環(huán)境保護(hù)．
【答案】A；C；D；C；D
【解答】
【點(diǎn)評(píng)】
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發(fā)布：2024/4/20 14:35:0組卷：40引用：1難度：0.7
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