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Mangroyes are trees that typically grow in saltwater along coasts.But some red mangroves end up deep in the rainforests of Mexico's Yucatan Peninsula.These plants live in freshwater along the San Pedro Martir River.That's nearly 200 kilometers from the sea.Scientists wanted to know how these mangroves got trapped so far inland.Carlos Burelo was among them.He became curious about these mangroves on a childhood fishing trip there 35 years ago.Burelo saw that the roots of the mangroves grew above ground.This was different from the other trees.
   Burelo's team first investigated where the freshwater mangroves came from.They started by collecting their leaves and then compared their DNA to the leaves from coastal mangroves which were growing along the Gulf of Mexico.The DNA helped identify the origins of the mangroves on the San Pedro Martir River.They had started along the Gulf of Mexico，some 170 kilometers away from the river.The team discovered other evidence that this ecosystem had once been coastal.They discovered 112 other species in this region that are typically found near coasts.
   The researchers looked at the soil too. "These sediments（沉積物）near the mangroves revealed exactly what we expected，says Exequiel Ezcurra，an ecologist at the University of California.In all，the researchers turned up coastal stones，shells of sea snails and clay sediments rich in shell fragments（碎片）.These led the researchers to conclude the area used to be part of the ocean long ago.
   Computer models of how sea level has changed over time confirmed those findings.The models showed that when sea levels were higher in the past，the ocean merged with the lower basin of the San Pedrc Martir River.That would have been around 150，000 to 130，000 years ago.This pushed red mangroves and other species inland.
   "This discovery highlights how changes to the past climate have affected the world's coastlines， " Ezcurra says. "It also offers a chance to better understand how future sea level rise may affect these ecosystems. "

（1）What did Burelo notice as a child？
C
C

A．The changes of the sea water.
B．The problems facing the rainforest.
C．The unusual roots of some mangroves.
D．The influence of mangroves on fishing.
（2）What can we infer about the freshwater mangroves and the coastal ones？
A
A

A．They are close in DNA.
B．They have different leaves.
C．They have different origins.
D．They both have many species.
（3）What does the research of the soil show？
B
B

A．The composition of the soil is very complicated.
B．The freshwater mangroves once grew in the sea.
C．Sea creatures influence the growth of mangroves.
D．The sea level has little change over the past years.
（4）What does the underlined phrase "merged with" in Paragraph4 probably mean'？
D
D

A．Developed from.
B．Changed into.
C．Depended on.
D．Combined with.

【考點(diǎn)】說(shuō)明文；科普知識(shí)．

【答案】C；A；B；D

【解答】

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發(fā)布：2024/4/20 14:35:0組卷：7引用：3難度：0.5

相似題

1．At the beginning of Grade Two，I joined the cross-country running team in our school.
   When I came to the first practice，I was filled with optimism.But as the distance we ran in each practice gradually increased from three to four，to six miles，I realized with surprise that no matter how hard I tried，I wasn't able to run as fast as others.In fact，I was one of the slowest on the team.
   What was the point of putting myself through so much pain？After the first few weeks，I wanted to quit.
   Then we had our first cross-country meet.
   When we started the race，I felt the great pressure of expectations sink onto my shoulders.And after a while I stopped running and struggled to walk up the hill.But then I heard my coaches shouting my name from the top of the hill.I felt confused and embarrassed；why were they cheering for me？I was running terribly!As I tried my best to finish the race，I realized that my coaches didn't care how fast I ran.Neither did my teammates.During the rest of the season，they were always on the sidelines of every race，cheering for me just as loudly as they'd cheered for the front runner.
   From then on，I began to put my effort into supporting my teammates instead of focusing on my own performance.In that way，I celebrated my teammates' victories as if they were my own；I felt their pain and exhaustion as if they were my own.
   Cross-country running made me realize I don't need to be the best to be successful in life.It taught me to value my relationships with people more than my relationship with my ego.It taught me to cheer for others even if I don't know their names.

（1）Why did the author want to give up after the first few weeks？

A．He had much pain in his knees.
B．He didn't perform well in long-distance running.
C．He couldn't get along well with others
D．He showed no interest in running.
（2）Which of the following can best describe the coaches？

A．Strict and hard-hearted.
B．Brave and adventurous.
C．Considerate and supportive.
D．Optimistic and humorous.
（3）After his first cross-country race，the author

.
A．lost himself in victories
B．put more effort into his study
C．received more support from his coaches
D．started caring about his teammates
（4）What did the author realize from his experience？

A．The importance of team spirit
B．The value of competition
C．The secret of winning a race
D．The benefits of doing sports
發(fā)布：2024/11/7 19:30:1組卷：5引用：7難度：0.5
解析
2．If you are a fruit grower—or would like to become one—take advantage of Apple Day to see what's around.It's called Apple Day but in practice it's more like Apple Month.The day itself is on October 21，but since it has caught on，events now spread out over most of October around Britain.
   Visiting an apple event is a good chance to see，and often taste，a wide variety of apples.To people who are used to the limited choice of apples such as Golden Delicious and Royal Gala in supermarkets，it can be quite an eye opener to see the range of classical apples still in existence，such as Decio which was grown by the Romans.Although it doesn't taste of anything special，it's still worth a try，as is the knobbly（多疙瘩的） Cat's Head which is more of a curiosity than anything else.
   There are also varieties developed to suit specific local conditions.One of the very best varieties for eating quality is Orleans Reinette，but you'll need a warm，sheltered place with perfect soil to grow it，so it's a pipe dream for most apple lovers who fall for it.
   At the events，you can meet expert growers and discuss which ones will best suit your conditions，and because these are family affairs，children are well catered for with apple-themed fun and games.
   Apple Days are being held at all sorts of places with an interest in fruit，including stately gardens and commercial orchards （果園）.If you want to have a real orchard experience，try visiting the National Fruit Collection at Brogdale，near Faversham in Kent.

（1）What can people do at the apple events？

A．Attend experts' lectures.
B．Visit fruit-loving families.
C．Plant fruit trees in an orchard.
D．Taste many kinds of apples.
（2）What can we learn about Decio？

A．It is a new variety.
B．It has a strange look.
C．It is rarely seen now.
D．It has a special taste.
（3）What does the underlined phrase "a pipe dream" in Paragraph 3 mean？

A．A practical idea.
B．A vain hope.
C．A brilliant plan.
D．A selfish desire.
（4）What is the author's purpose in writing the text？

A．To show how to grow apples.
B．To introduce an apple festival.
C．To help people select apples.
D．To promote apple research.
發(fā)布：2024/11/9 20:0:2組卷：22引用：1難度：0.5
解析
3．One animal which is still alive，but has almost disappeared from the world，is the Chinese river dolphin or Yangtze River dolphin.
   The Yangtze River dolphin is a beautiful animal with a graceful body and a long nose.It is blue-grey with a white underside，weighs between 100 and 160 kilogrammes，and can grow up to eight feet long.It lives in the middle and lower parts of the Yangtze River.Most dolphins live in the sea so the Yangtze River dolphin is very unusual.It is one of only five kinds of river dolphins in the world.
   In the past，there were many stories about the Yangtze River dolphin.One story said that the dolphin was really a beautiful princess who had drowned in the river.Another said it was a kind of horse that could gallop（急速行進(jìn)）across water，carrying God on its back.
   Sadly，the situation today is very different.Many millions of people live in the Yangtze River Basin and the river is busy，noisy and polluted.The Yangtze River dolphin is almost blind and moves around using sounds.With so many boats and people using the river，the animals cannot find their way around.They are unable to find food，or find each other.Year by year，the number of Yangtze River dolphin in the river becomes smaller and smaller.
   A lot of work is being done to help the Yangtze River dolphin.One section of the river has been made into a kind of nature park，where the Yangtze River dolphin can be safe.Fishermen work together with scientists and tell them when they see a Yangtze River dolphin，or if they find an injured one.Injured animals are taken to a research center and nursed back to be healthy.However，in spite of these measures，scientists estimate （估計(jì)）that the number of the Yangtze River dolphin still alive in the river may be less than 100.If things continue as they are，the lovely creature will disappear in the next 25 years.

（1）Which of the following cannot be learnt from the passage？

A．The Yangtze River dolphin has already died out from the world.
B．The Yangtze River dolphin is blue-grey with a white underside.
C．The Yangtze River dolphin lives in the middle and lower parts of the Yangtze River.
D．The Yangtze River dolphin is one of only 5 kinds of river dolphins in the world.
（2）The reasons why the Yangtze River dolphin is disappearing don't include

.
A．many millions of people live in the Yangtze River Basin，making there noisy and polluted
B．the Yangtze River dolphin is blind because of the pollution and can't find the way around
C．the boats and people are noisy，making the animals cannot find their way around by sounds
D．they are unable to find food or find each other by sounds since the river is noisy
（3）Which of the following is the correct way to save the Yangtze River dolphin？

A．Catch the Yangtze River dolphins and take them to the research center.
B．Make the whole Yangtze River a natural park for the Yangtze River dolphin to live.
C．Make one section of the Yangtze River a natural park where the Yangtze River dolphins can be safe.
D．Ask many people to come to the river to help the Yangtze River dolphins.
發(fā)布：2024/11/8 18:30:1組卷：5引用：1難度：0.5
解析

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