Mars(火星)appears to be flowing with small streams of salty water,at least in the summer,scientists reported Monday."It suggests that it would be possible for there to be life today on Mars," NASA's science mission chief,John Grunsfeld,said at a news conference on September 28,2015.
The streams are about 12 to 15 feet wide and 300 feet or more long,scientists said."What we're dealing with is wet soil.Thin layers of wet soil,not standing water," said Aifred McEwen of the University of Arizona at Tueson,the principal scientist for the Mars Reconnaissance Orbiter's high-resolution imaging experiment.
Because liquid water is extremely necessary to life,the findings could have major possible effects for the possibility of Martian life.The researchers said further exploration is needed to determine whether microscopic life exists on the planet.
The presence of liquid water could also make life easier for astronauts visiting or living on Mars.Water could be used for drinking and for creating oxygen and rocket fuel.NASA's goal is to send humans there in the 2030s.
The evidence of flowing water consists largely of dark,narrow streaks(條痕)on the surface that tend to appear and grow during the warmest Martian months and fade the rest of the year.
Mars is extremely cold even in summer,and the streaks are in places where the temperature is as low as minus 10 degrees Fahrenheit.But salt can lower the freezing point of water and melt ice.
The source of the water is a mystery(神秘的事物).Scientists noted it could be melting ice.It could be an underground aquifer(砂石含水層),which is rock or sand that can hold water.It is possibly water vapor from the thin Martian atmosphere,or it may be a combination Michael Meyer,lead scientist for NASA's Mars exploration program, said the only definitive way for now to determine whether there's life on Mars is to collect rocks and soil for analysis on Earth-something a U.S.lander set for lift-off in 2020 will do.
1.What matters to the existence of liquid water on Mars?
A. The distance from the sun. B. The favorable climate.
C. The gravity of the earth. D. The salt in it.
2.According to John Grunsfeld,on Mars there seems to be .
A. salty water B. standing water
C. rocket fuel D. human beings
3.Scientists are uncertain about the of the water on Mars.
A. state B. source
C. temperature D. taste
4.What would be the best title for the text?
A. Streams of Water Spotted on Mars
B. Astronauts Will Land on Mars
C. NASA's Mars Exploration Program
D. A Breakthrough in the Exploration of Mars
科目:高中英語 來源: 題型:閱讀理解
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科目:高中英語 來源:普通高等學(xué)校招生2017年全國統(tǒng)一考試(終極押題卷1)英語試卷 題型:閱讀理解
US President Donald Trump's senior adviser Kellyanne Conway has come under fire after picture of her casually kneeling on a couch in the Oval Office was widely shared on social media.
In an image captured by an AFP photographer,Conway appears on the couch with her shoes on as Trump poses for a photo with leaders of historically black colleges and universities.
Wall Street Journal columnist Bret Stephens was among those taking aim at Conway,suggesting that aides under previous administrations would have caused even greater outcry.
"If Rice or Jarrett had sat like this in Oval Office,conservatives(保守黨黨員)would have screamed themselves hoarse for weeks.Now we own trashy," he wrote.
Trump's predecessor Barack Obama was repeatedly attacked for photos in which he appeared to be relaxing. Critics also condemned Obama for unbuttoning the previous Oval Office dress code that called for a suit jacket and a tie.
The image of Conway was spread widely on social media,with several Twitter users criticizing her for what they described as a lack of respect in the Oval Office.
This is not the first time Conway has found herself at the centre of a storm.She recently came under fire for plugging(宣傳)the fashion brand of the president's daughter.
The head of the US Office of Government Ethics urged the White House to investigate Conway after the incident,saying she should face disciplinary(懲戒性的)action.
1.What do we know about Rice and Jarrett mentioned in Paragraph 4?
A. They once screamed themselves in Oval Office.
B. They were both Obama's assistants under previous administrations.
C. They are senior advisers now.
D. They have found themselves at the centre of a storm.
2.What does the underlined word "trashy" mean in Paragraph 4?
A. Of no value. B. Rubbish.
C. Satisfying. D. Precious.
3.Why was President Barack Obama criticized by some social media?
A. Barack Obama didn't make achievements as the US President.
B. Barack Obama was repeatedly seen wearing informal clothes in the Oval Office.
C. Barack Obama preferred Rice or Jarrett to behave casually in the Oval Office.
D. Barack Obama ordered Rice to plug the fashion brand of his daughter. .
4.What might happen to Conway according to the text?
A. She would be promoted.
B. She might be praised by President Donald Trump.
C. She might be given disciplinary treatment.
D. She would apply for resignation.
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科目:高中英語 來源:河北省2016-2017學(xué)年高一下學(xué)期期中考試英語試卷 題型:七選五
How to write a Letter to Parents
As a teacher, one of the most difficult parts of your job is working with parents. 1. Writing a letter to parents is one way to do this. If you do it properly, this is an excellent way to communicate when you cannot meet with parents face to face.
·Put positive communication in the letter, even if you are writing to discuss a problem. 2. Even if it is difficult, you must find this positive spin(言辭), because it will make the parents more open to what you have to discuss. The general rule is “start with the good, hit them with the bad, then end on a positive note”.
·Share the problem with the parents. Express your concern and desire to help. 3. Show them through the letter that you want to work with them to find a solution to the problem.
·4. You can ask them to write back, sign a part of the letter or give you a call. If you do not hear from them, you should call them. Be caring, but make sure they got the communication. Remember, your goal is to work together to help their child succeed.
·Consider mailing the letter to the parent, rather than sending it home with the student. Some students will intentionally forget to give the letter to their parents, while others will accidentally or purposely lose the letter. 5.
A. Ask for a response.
B. Respect parents and never quarrel with them.
C. Whenever you meet with problems, you should keep cool.
D. Sending it in the mail makes it more certain that it will be received.
E. Do not place it completely on their shoulders, as they may hate this action.
F. You can do this by pointing out a little progress the child has made recently.
G. With proper communication, however, you can build bridges between the school and home.
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科目:高中英語 來源:安徽省蚌埠市2017屆高三第三次教學(xué)質(zhì)量檢查英語試卷 題型:短文填空
International Volunteer Day is a global celebration of volunteers.It takes place every year on December 5 1.(shine) a light on the effect of volunteer efforts everywhere.Many nations and governments hold2.(variety) activities in this day.Volunteers are ones3.make use of their own part-time time and participate in social service for no charge.They contribute a lot in the4.(aspect) of rebuilding home,developing economy with promoting social civilization progressing etc.The Day5.(encouragement) volunteers' deeds to develop at local,national and international levels.The Day is the time widely6.(accept)by people to fight poverty,hunger,disease,environmental problems and discrimination against women.
The cultural form and explanation of a volunteer may change depending on circumstances,7.the basic principle never changes:every individual can make a difference in society.Beyond8.(help) to promote the greater good,volunteers enrich their own lives.As one volunteer once put9.,"I feel as though I am able to help in the world and use my skills.It allows me to10.(real) feel as though I am part of the world community."
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科目:高中英語 來源:普通高等學(xué)校招生2017年全國統(tǒng)一考試(終極押題卷2)英語試卷 題型:完形填空
Tu Youyou has become the first Chinese woman to win a Nobel Prize, for her work in helping to __ an anti-malaria (抗皰疾) medicine. The 84-year-old’s route to the honour has been anything __ traditional.
Tu Youyou went to a __ school in Beijing. Shortly after, she became a researcher at the Academy of Chinese Traditional Medicine. In 1967, Chinese government decided there was an national __ to find a cure for malaria. __ the time, malaria __ by mosquitoes was killing Chinese soldiers fighting Americans in the jungles of northern Vietnam. A secret research unit was __ to find a __ of the illness.
Two years later, Tu Youyou became the new __ of the research team. She went to the southern Chinese island of Hainan to study __ malaria damaged human __. For six months, she stayed there. __ her four-year-old daughter at a local nursery.
__ Chinese texts inspired Tu Youyou’s search for her Nobel-prize winning medicine. She and her teammates poured over ancient books to find __ ways of fighting malaria.
__ the team found a brief reference to one substance,which had been used to treat malaria in China around 400 AD.
After the drug showed __ results in mice and monkeys ,Tu Youyou volunteered to be the __ human recipient(接受者) of the new drug.
Fuming Liao, who has worked with Tu Youyou for more than 40 years, __ her as a “tough and __ woman” Stubborn enough to spend decades reading ancient texts and use them in modern scientific __. The result has saved millions of lives.
1.A. do B. create C. give D. test
2.A. and B. while C. whether D. but
3.A. medical B. cold C. excellent D. affordable
4.A. wonder B. doubt C. need D. expression
5.A. In B. After C. Before D. At
6.A. spread B. offered C. held D. said
7.A. opened B. fixed C. formed D. invented
8.A. hand B. treatment C. cure D. rescue
9.A. head B. judge C. researcher D. workmate
10.A. where B. when C. what D. how
11.A. power B. ability C. health D. concern
12.A. asking B. letting C. leaving D. sending
13.A. Ancient B. Many C. Reliable D. New
14.A. useful B. historical C. hopeful D. helpful
15.A. Finally B. Exactly C. Gradually D. Frequently
16.A. grateful B. active C. hopeful D. thankful
17.A. only B. first C. willing D. right
18.A. tells B. describes C. speaks D. thinks
19.A. stubborn B. hard C. generous D. educated
20.A. classes B. conditions C. styles D. research
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科目:高中英語 來源: 題型:選擇題
A. | identifies | B. | purifies | C. | classifies | D. | clarifies |
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科目:高中英語 來源: 題型:選擇題
A. | struggle; rid of | B. | campaign; get rid of | ||
C. | battle; rid of | D. | fight; get rid of |
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科目:高中英語 來源: 題型:選擇題
A. | acknowledge | B. | differentiate | C. | confirm | D. | justify |
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