Researchers following tiger sharks off the southern coast of Belize couldn't believe their eyes when they recently caught a different kind of fish.It turned out to be a Greenland shark，which is typically found in the Arctic and can live to be about 400 years old.
The team of scientists thought the shark was dead when they finally pulled it to the surface.Unlike the tiger sharks they saw，this particular shark had black，worn-looking skin and pale blue eyes.Devanshi Kasana，a Ph.D．candidate at the Florida International University's Predator Ecology &；Conservation Lab，said the shark looked "really old".
There was no doubt that the discovery was unexpected.Kasana said， "As soon as it entered our field of vision，we saw a black figure that was getting bigger and bigger.When it came to the surface，none of the crew with all of their combined fishing experience had seen anything like that." She said the discovery was especially exciting.She wondered how on earth these sharks，which were thought to mainly exist in the Arctic，could be found in the tropics as well.
Greenland sharks can be several hundred years old.The reason for their long life may have something to do with their speed of growth，which is very slow.Greenland sharks grow approximately one-third of an inch per year and can grow to more than 20 feet in length.And researchers believe the sharks don't reach sexual maturity until sometime after the first 100 years of their life.
According to Kasana，some scientists have theorized that the Greenland sharks can be found across the globe，if one knows where to look.They love cold water，which is why they're found in the Arctic.However，they've also been discovered as far south as off the coast of Georgia，thousands of feet beneath the ocean surface.
The theory is that the closer the sharks are to the equator，the deeper researchers have to go to find them.And they go deep over 7，000 feet down，according to NOAA．
（1）What can we learn about the caught Greenland shark？ CC
A．It is 400 years old.
B．It looks just like a tiger.
C．It has unique appearance.
D．It only lives near the Arctic.
（2）What does Kasana think of the discovery？ DD
A．Doubtful and fearful.
B．Common and expected.
C．Exciting and threatening.
D．Surprising and confusing.
（3）What mainly contributes to Greenland sharks' long life？ DD
A．The early maturity.
B．The mild environment.
C．The length of their bodies.
D．The slow pace of their development.
（4）What is the text mainly about？ CC
A．The longest-living shark in the world.
B．The oldest fish living near the equator.
C．A Greenland shark appearing in Belize.
D．A theory about the long life of wild fish.
【答案】C；D；D；C
【解答】
【点评】
声明：本试题解析著作权属菁优网所有，未经书面同意，不得复制发布。
发布：2024/8/21 10:0:1组卷：6引用：4难度：0.5
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