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The population of a sea creature known as the sunflower sea star,which was once plentiful along the Pacific coastline from Mexico's Baja California peninsula(半島)to Aiaska,has been reduced sharply these years.Approximately 90%of them have disappeared since 2013 due to a mysterious sea star wasting syndrome(海星消瘦綜合癥).
   One of the factors likely to have led to the death of sea stars is rising ocean temperatures caused by climate change,according to some scientists.The ocean absorbs most of the excess atmospheric heat caused by greenhouse gas emissions,which has the effect of increasing the temperature of the water.Many sea creatures can only tolerate very small changes to their environment.
   Sunflower sea stars feed on sea urchins (海膽).Sea urchins feed on seagrass.Without the presence of sunflower sea stars,their key predator(捕食者)in the food chain,sea urchin populations have boomed.That has led to the death of many sea grasses—which in turn contributes to the climate crisis,as seagrass is a valuable tool to store carbon dioxide.
   Scientists at the University of Washington have been working on that.At their laboratory on San Juan Island,they have been growing a new generation of sunflower sea stars that can be used to repopulate coastal waters.Jason Hodin,a research scientist at the University of Washington's Friday Harbor Labs said that they're hoping the program can help in the process of recovery of the sunflower sea star and finally,recovery of the health of ecosystems like seagrass that is under threat right now.
   To test the sea stars' ability to bear warming seas,scientists have these tiny creatures subjected to fluctuations(波動(dòng))in water temperatures in the lab.Some of the young adult sea stars are being raised in water that is slightly warmer than normal,and are showing signs of being able to cope with the added warmth."These are not typical ocean temperatures around here,but the success indicates that they at least have the ability to endure the warmer water,"said Hodin.

(1)Which could be a possible reason for the death of sunflower sea stars?
B
B

A.Habitat loss.
B.Climate change.
C.Food shortage.
D.Ocean pollution.
(2)What does paragraph 3 mainly talk about?
C
C

A.The living habits of sunflower sea stars.
B.The importance of seagrass to the environment.
C.The key role of sunflower sea stars in the food chain.
D.The consequences of the increasing sea urchin populations.
(3)How do scientists help increase the population of sunflower sea stars?
D
D

A.By developing devices to cool sea water.
B.By improving the environment of coastal waters.
C.By growing plentiful seagrass to absorb carbon dioxide.
D.By experimenting on raising a new generation of the creature.
(4)What does Jason Hodin think of the program?
A
A

A.It is meaningful.
B.It is complicated.
C.It is harmful.
D.It is disappointing.

【考點(diǎn)】說明文;自然科學(xué)研究成果
【答案】B;C;D;A
【解答】
【點(diǎn)評】
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發(fā)布:2024/5/27 14:0:0組卷:0引用:1難度:0.3
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