Road networks are expanding worldwide at an alarming rate. Although roads can promote economic development and improve human welfare, they can also have severe effects on wildlife populations by worsening habitat and human disturbance. Moreover, traffic disturbance from noise, lights, and motion reduces the quality of habitat near roads.
While roads are now everywhere across much of the earth, the construction of new roads will be concentrated in areas with high biodiversity value. Many of these new roads and highways will likely cross reserves or other highly biodiverse areas. Although roads are one of the most important impacts on global ecosystems, we know little about how patterns in road construction will affect biodiversity in the coming decades.
Here, we use a recently developed global roads data set to investigate the extent and potential influence of road networks across the 1,160,000-km,13-country range of the globally endangered tiger. In the Russian Far East, for example, roads reduce tiger survival rates due to crashes into vehicles. In some regions, tigers avoid areas closer to public roads, suggesting that roads act as important barriers to movement. The emerging impacts of road development on tigers are critical for several reasons.
We calculate road density (度), distance to the nearest road, and relative mean species abundance (MSA) to characterize how road networks influence tiger habitats. These systems of measurement provide starting points for range-wide monitoring and impact assessments of road development projects, thus enabling evaluation of progress toward country-level conservation and sustainable (可持续的) development goals.
1.What is the second paragraph mainly about?
A.The importance of creating reserves.
B.The destruction to global ecosystems.
C.The effect on biodiversity worldwide.
D.The opinion about road construction.
2.Why is road development attacked?
A.It has bad influence on tigers.
B.It causes more traffic accidents.
C.It covers too many areas.
D.It requires a quantity of funds.
3.How does the author feel about the systems of measurement?
A.Optimistic. B.Doubtful.
C.Concerned. D.Astonished.
4.In which section of a website may the text appear?
A.Entertainment. B.Health.
C.Education. D.Science.
Recently Stiles aged 17 took her 3-year-old brother, James, to her high school. A family emergency prevented her parents from being able to pick up James. So they asked Stiles to step in.
''This was a one-time event; we have never had her get him from school other than this day But it was an emergency, '' her mother said. ''I figured she had gone to get him and taken him home Later that day I saw the picture online and realized that she had taken him back to school. ''
Little James quickly fell asleep in his big sister's arms at the high school.
She didn't want to be counted absent or miss any work. Stiles was studying to be a nurse. She was in her class, and the teacher gladly welcomed her little brother in. He was so tired from his school that he slept most of the class. She not only helped her family out but returned to her responsibility at school.
Her teacher was very supportive and didn't mind him being in the class at all. He slept most of the time and if he had become a problem she would have taken him out. She attends an amazing school that clearly sees the value in family and education.
Her mom said she can now put to rest any worries she's had that the 14-year age gap between Stiles and James would keep them from being close. As a mom, she was thankful that they had this kind of relationship, and she prayed it would always stay this way.
1.Why did Stiles' parents ask her for help?
A.Her family had an emergency.
B.Her parents couldn't collect James.
C.Her brother refused to attend school.
D.She was close to being an adult.
2.Where did Stiles want to work when she grew up?
A.In a hospital.
B.In a school.
C.In a factory.
D.In a shop.
3.What was Stiles' teacher's attitude to her act?
A.Opposed.
B.Critical.
C.Ambiguous.
D.Supportive.
4.What once made Stiles' mother concerned?
A.Stiles' identity of being a senior high student.
B.Stiles' terrible relationship with her classmates.
C.The age difference between Stiles and her brother.
D.Stiles' bad performance in the key school.
Spending time outdoors can reduce stress and increase overall health. Stuck inside? You can still connect with nature with a virtual visit to a national park. Four of the most visited national parks in the nation offer creative ways for visitors at home to explore its beauty.
Grand Canyon National Park
On a Grand Canyon virtual archaeological tour, armchair travelers get an inside look at the first major archaeological site along the Colorado River in nearly four decades. A series of interactive 360-degree photos show the archaeologists (考古学家) at work, with insight into their tools and methods.
Yosemite National Park
Few national parks have more natural wonders than Yosemite. Visitors can see water pouring down from Yosemite Falls or look up at Half Dome from the floor of Yosemite Valley.
Olympic National Park
Olympic National Park protects a rainforest ecosystem (生态系统) largely untouched by human habitation. It also protects an incredible range of habitats and impressive biodiversity (生物多样性).
A set of beautiful interactive wall paintings appeals to those with an interest in plants and animals. Click through the images to learn more about what’s growing in the park.
Yellowstone National Park
America’s oldest national park is also one of the easiest to tour virtually. You can watch Old Faithful erupt in real time or send an audio postcard featuring the sounds of springtime, the barks and howls of wolves at Blacktail Pond.
1.What is special about Grand Canyon National Park?
A.It provides a wide range of photos for tourists.
B.It offers travelers chances to act archaeologists.
C.It makes visitors understand archaeological tools.
D.It has a history of approximately forty years.
2.What attracts tourists most in Olympic National Park?
A.The rainforest ecosystem.
B.Attractive wall paintings.
C.Various amazing habitats.
D.Impressive natural wonders.
3.Which park do you choose to hear nature in spring?
A.Grand Canyon National Park.
B.Yosemite National Park.
C.Olympic National Park.
D.Yellowstone National Park.
假定你是李华，你的英国朋友 Leslie 给你发邮件询问你在新型冠状病毒肺炎疫情期间是怎么度过。请你根据下列要点写一封邮件回复她:
1. 爆发时间； 2. 怎么度过； 3. 你的感受。
注意：1.词数 100 左右；
2.可以适当增加细节，以使行文连贯；
参考词汇：疫情 epidemic situation 新冠肺炎 novel coronavirus pneumonia
Dear Leslie,
________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
Yours sincerely,
Li Hua
短文改错
It was raining light when I got up yesterday. After a quick breakfast, I took a umbrella with me and went to school in a hurry. It was fifteen minutes after school began. I was running quickly when I see an old man walking slowly in the rain. I stopped, wondered whether to help him or not, as I might be late for school. Then I made a decision walk him home. About ten minutes late, we arrived at his house. He thanked for me again and again. I smiled and said it was nothing. I was late when I got to school. Hearing my story, the head teacher, that was giving his lecture, praised me before all the student.
阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。
Monkeys do not like it when others get more food 1. they do, according to a new study.
Researchers from Yale and Harvard universities found Capuchin monkeys punish monkeys 2. get more food. "This sort of, 'If I can't have it, no one can' response is because 3. psychological spite (怨恨), and it was4. (previous) thought unique to humans," said Kristin Leimgruber of Harvard University. She is a co-author of the research study. The researchers watched as some Capuchin monkeys 5. (give) more food than others. They found that monkeys getting the 6. (small) share pulled a rope to fold up a table holding the other monkey's bigger share.
Another lead researcher, Laurie Santas, 7. (explain) over email, "I think what we can conclude about humans is that some of our more embarrassing tendencies have relatively deep 8. (root)." Santos said the spiteful response was not present with another member of the ape species—chimpanzees(黑猩猩).
An earlier study, she said, showed chimpanzees would fold up the table of other chimpanzees 9. (steal) food from them. But they would not punish chimpanzees who just happened 10. (have) more food, Santos said. In other words, it was fine if another chimpanzee had more food as long as they did not steal it.
