During the power transition earlier this year, analysts said, Chinese leaders tried to demonstrate their _______ to fighting corruption.
A. greed B. commitment
C. rensponsibility D. motivation
高二英语单项填空中等难度题
During the power transition earlier this year, analysts said, Chinese leaders tried to demonstrate their _______ to fighting corruption.
A. greed B. commitment
C. rensponsibility D. motivation
高二英语单项填空中等难度题查看答案及解析
Computers have beaten human world champions at chess and, earlier this year, the board game Go(围棋). So far, though, they have struggled at the card table. So we challenged one AI(artificial intelligence) to a game.
Why is poker so difficult? Chess and Go are “information complete” games where all players can see all the relevant information. In poker, other players’ cards are hidden, making it an “information incomplete” game. Players have to guess opponents’ hands from their actions----tricky for computers. Solving poker could lead to many breakthroughs, from cyber security to driverless cars.
Scientists believe it is only a matter of time before AI once again vanquishes humans, so our human-machine match comes up in a game of Texas Hold’s Em Limit Poker. The AI was developed by Johannes Heinrich, a researcher studying machine learning at UCL. It combines two techniques: neural(神经的)networks and reinforcement learning(强化学习).
Neural networks, to some degree, copy the structure of human brains: their processors are highly interconnected and work at the same time to solve problems. They are good at spotting patterns in huge amounts of data. Reinforcement learning is when a machine, given a task, carries it out, learning from mistakes it makes. In this case, it means playing poker against itself billions of times to get better.
Mr Heinrich told Sky News: “Today we are presenting a new procedure that has learned in a different way, more similar to how humans learn. In particular, it is able to learn abstract patterns, represented by its neural network, which allow it to deal with new and unseen situations.”
After two hours of quite defensive play, from the computer at least, we called it a draw.
1.Why can’t the computer beat humans at the poker game?
A. Because humans are cleverer than the computer
B. Because humans practice playing the poker game every day
C. Because the computer can’t learn the regular rules of the poker game
D. Because the computer can’t know the other players’ cards completely
2.What does the underlined word “vanquishes” in Paragraph 3mean?
A. Leaves B. Defeats
C. Cheats D. Serves
3.What do we know about the reinforcement learning of AI?
A. It solves problems correctly every time
B. It is the same as the learning of humans
C. It learns from the mistakes appearing in a task
D. It is more developed than the studying ways of humans
4.What can be inferred from the text?
A. The new procedure of AI has some features of humans
B. Computers are stronger than humans in every aspect
C. Humans will beat computers at playing poker forever
D. Scientists feel unhappy about the result of the poker game
高二英语阅读理解中等难度题查看答案及解析
Let E-bikes Power New York's Transit Future
Providence, R. I., just became the 13th city to develop an electric-assisted bike-share system, which runs or is developing bike-share networks in cities across the United States. Ironically, the Brooklyn-based company cannot operate in its hometown of New York City,due to the wrongheaded ban on electric bicycles.
In many major cities in the U. S. and abroad, e-bikes are flourishing and helping to solve major urban challenges. Stockholm is adding 5, 000 e-bikes to its bike-share system. UPS is delivering packages in Hamburg using electrically-assisted cargo tricycles. And San Francisco's DoorDash food delivery service has found e-bikes to be the best mode to navigate heavy traffic and limited parking.
In striking contrast, New York City insists e-bikes are banned under law. More than 900 e- bikes were seized and more than 1, 800 summonses（召回）were issued by the New York Police Department in 2017,following Mayor de Blasio's decision to limit e-bike usage, despite the fact that no data or records exist to show e-bike-related safety incidents.
Who does the e-bike restriction hurt? The e-bikes seized in 2017 primarily belonged to food delivery workers, who are immigrants from Asia and Latin America. New Yorkers love their delivery: A new study from the New York City Department of Transportation found that more than half of city residents receive food deliveries at least a few times per month."
In fact, the top three neighborhoods for e-bike summonses-the Upper East and West Sides and East Midtown-also consisted of more than 70% white residents. It's difficult to divorce the
penalty of workers of color from the predominantly white, rich neighborhoods to whom the meals are delivered.
It is true that the rush to maximize delivery numbers leads to higher speeds and potentially dangerous biking. To that end, the city should improve and enforce safe cycling and expand bicycling infrastructure to ensure safe passage for cyclists and pedestrians.
Outside New York, cities and companies are finding that e-bikes are convenient, have low carbon footprints and require less space than cars on city streets. As New York City seeks to improve traffic, better air quality and encourage active modes of transportation, it is confusing that a mode that checks all of those boxes would be outlawed.
The city must stop pedaling backwards on both workable transportation modes and the racially-charged policies surrounding them. It is time for New York City to embrace e-bikes as the very useful, worker-enabling, convenient and environmentally-forward mode that they are.
1.Why are e-bike usage situations in major cities in the U. S. and abroad mentioned?
A. To compare the differences of e-bike development in major cities.
B. To describe the advantages of e-bike systems around the world.
C. To arouse attention on the popularity of e-bikes from readers.
D. To question the policy on e-bike usage in New York City.
2.We can learn from the passage that＿・
A. e-bikes failed to solve major urban challenges
B. data and records showed e-bikes caused traffic accidents
C. only the immigrants needed the e-bikes for food delivery
D. there have been strict regulations banning the e-bikes on road
3.The underlined phrase "checks all of those boxes" in paragraph 7 means_.
A. meets the requirements B. unlocks the boxes
C. includes the requirements D. examines the boxes
4.What is the writer's attitude towards using e-bikes in New York City?
A. Skeptical. B. Supportive.
C. Objective. D. Negative.
高二英语阅读理解困难题查看答案及解析
____ people were said to enjoy a “5-D” light show during the New Year celebrations in Shanghai.
A. A large amount of B. A large number
C. A good many D. A great deal of
高二英语单项填空简单题查看答案及解析
Earlier this morning I e-mailed an old friend, Mark. We have been out of touch for 12 years, but the 36 is a wonderful thing. Finding his e-mail address 37 less than a minute. He is working on his doctoral paper in western America.
Mark and I met at a summer 38 that we both attended. I went every year from the time I was 8 or 9 until I was 15. I don’t 39 exactly, but I think Mark was there for as many years as I was.
We lived close to each other and 40 saw each other around the campsite, but not often. Mostly we stayed together for a week or two in the 41 and wrote letters back and forth during the rest of the first few years. I still have all of his letters in a box somewhere. I come across them occasionally and 42 to sit down and read through them, but I never have. He was a 43 and precious friend to me, and I am deeply 44 that we have drifted so far apart.
Mark was a very kind and incredibly bright and funny 45. He loved Monty Python — I mean he was a fanatic(狂热者), and could 46 entire movies from memory. He was one of those kids who 47 such a unique and powerful mind 48 they never quite fit into the main stream of life. 49 Mark, who I believe realized that, never seemed to care about it. When I knew that Mark was working on his 50 (on a highly intellectual and fairly mysterious and difficult topic), I thought, “Well yes, of course.” He is just where I would
51 him to be.
I wonder if he will write me back. I wonder if he will be 52 by where I am. I wonder whether he and I can be 53 again, or whether these years have left us with 54
in common. I wonder whether he can ever be the man I 55 , or only remain the boy I knew.
1.A. world B. Internet C. life D. fax
2.A. cost B. paid C. took D. spent
3.A. train B. meeting C. camp D. holiday
4.A. remind B. recall C. remember D. realize
5.A. occasionally B. regularly C. usually D. commonly
6.A. neighborhood B. group C. holiday D. summer
7.A. manage B. advise C. intend D. prefer
8.A. likely B. friendly C. coldly D. dear
9.A. regret B. sorry C. excited D. satisfied
10.A. teenager B. adult C. reader D. camper
11.A. see B. recite C. write D. read
12.A. gained B. had C. got D. deserved
13.A. that B. as C. because D. so
14.A. Because B. Though C. Since D. But
15.A. book B. novel C. paper D. lesson
16.A. let B. lead C. expect D. allow
17.A. shocked B. surprised C. disappointed D. excited
18.A. classmates B. partners C. enemies D. friends
19.A. everything B. something C. nothing D. anything
20.A. value B. know C. dislike D. admire
高二英语完型填空简单题查看答案及解析
The company lost $7 million this quarter ________ a profit of $6.2 million a year earlier.
A. in contrast to B. with regard to
C. in favor of D. at the sacrifice of
高二英语单项填空简单题查看答案及解析
---- Johnson is said to be the first young teacher professor in your university this year.
---- Exactly. of his own competence is an important factor in his success.
A. promoted; Convinced B. to have been promoted; Convinced
C. promoted; Being convinced D. to have been promoted; Being convinced
高二英语单项填空中等难度题查看答案及解析
Weather experts said this year could be one of the strongest EL Nino events in recorded history. El Nino means severe weather conditions in parts of the world. In eastern Africa, for example, Kenya and Uganda are preparing for possible flooding. Yet South Africa and Malawi are already dealing with extremely dry weather.
El Nino is Spanish for “the child”. It usually begins in December, near the celebration of the birth of Jesus Christ. In fact, the weather event was named in his honor. El Nino develops when winds off the west coast of South America weaken. This permits warm water in the western Pacific to expand toward the east and the Americas. At the same time, clouds and rain over the warm water move east, too. El Nio conditions normally appear only about twice every 10 years. Usually, El Nino conditions continue for about 12 to 18 months. They bring warm weather to some areas. These areas become wetter than normal, while others become drier.
The United Nations Children’s Fund warns that many people are at risk from hunger, disease and water shortages resulting from El Nino. In the east and southern Africa up to 11 million children could be affected. East African countries usually experience heavy rainfall during the El Nino. Southern Africa usually has little rainfall which may lead to wildfires or drought(干旱).
Weather changes caused by El Nino depend on the strength of the condition. In the early 1980s, strong El Nino was linked to dry weather in Australia and Asia, rain and flooding in South America and high temperatures in many parts of the U.S. The years later, smaller El Nino caused trouble in parts of the U.S. It caused severe floods in the Southeast and the Middle West. Tom Di Leberto is a meteorologist(气象学家) at the National Oceanic and Atmospheric Administration in Washington, D.C. He said this year could be the third strongest El Nino on record. But we will not know for sure until all the weather records are examined.
1.The author writes the text to tell us_________.
A. many countries are preparing for the coming floods
B. Africa will probably suffer a lot form this year’s El Nino
C. this year could be one of the strongest El Nino on record
D. 11 million children could be affected by this year’s El Nino
2.The second paragraph is mainly about ____________.
A. what El Nino actually means
B. how El Nino comes into being
C. when El Nino will occur next time
D. why El Nino causes weather changes
3.Which of the following countries often suffers from flooding caused by El Nino?
A. Kenya B. Malawi
C. Australia D. South Africa
4.The author mentioned the 1980s’ El Nino and the 1990s’ El Nino to ______ .
A. explain why so many countries were affected by El Nino
B. prove weather changes caused by El Nino depend on its strength
C. argue that El Nino conditions usually appear about twice every 10 years
D. show scientists doubt whether this year will have the strongest El Nino
高二英语阅读理解中等难度题查看答案及解析
“This Friday we’ll have the yearly Egg Drop Challenge,” said our science teacher, Mr. Baker. “You can work alone or with a partner.”
My friend, Cassie, and I smiled at each other. We always worked on projets ______.
The ______ of the challenge was simple------to build a protective container to keep an egg from breaking when ______ the stadium wall.
I made my sandwich that afternoon while waiting for Cassie.______ the butter-cream gave me an idea.
“I have a brilliant design for our ______ container?” I said when Cassie arrived. “We can ______ the egg with some butter-cream.”
“Why not pit the egg in a basket with a parachute (降落伞)______?” Cassie rolled her eyes. “The parachute is better than that stupid idea.”
I couldn’t believe it. Of course we’d had our little ______ in the past, but she’d never called any of my ideas “______” before.
“Then I’ll build mine and you build yours!”
____ words had been out, our friendship was challenged.
When Friday finally arrived, I had to ______ Cassie’s Egg Force One looked pretty good.______, my Egg-cellent Egg Cream didn’t look quite scientific. We kids carried our containers up three stadium steps and dropped them over the side wall. Those whose eggs broke were out; those whose eggs survived ______ three more steps and dropped them again. This would go on till the last egg broke.
After four rounds, only Cassie and I were ______. I let go of my box. I heard someone say “ew” after seconds. Had my egg broken? I raced down the ______. The side walk was dotted with egg shells (蛋壳) from those ______ drops. Finally I found my little Egg-cellent Egg Cream.
“That looks like egg drop soup, Laura,” Cassie said. She was holding her Egg Force One. My ______ raced. Had she won? I looked at her basket.______.
“My egg bounced ______” she explained, pointing to a broken shell.
“A tie (平局),” Mr. Baker said.
Cassie looked at me, and her glare ______. I laughed. She smiled…
1.A. patiently B. silently C. together D. alone
2.A. function B. goal C. reason D. result
3.A. rolled down B. pushed against C. thrown at D. dropped over
4.A. Spreading B. Boiling C. Baking D. Holding
5.A. butter B. sandwich C. cream D. egg
6.A. protect B. replace C. carry D. mix
7.A. followed B. covered C. attached D. supported
8.A. ideas B. fights C. worries D. challenges
9.A. wrong B. stupid C. brilliant D. scientific
10.A. Since B. While C. But D. And
11.A. explain B. deny C. admit D. prove
12.A. Therefore B. Anyway C. Otherwise D. Besides
13.A. paced down B. turned around C. walked up D. went back
14.A. left B. wanted C. chosen D. discovered
15.A. steps B. way C. wall D. sidewalk
16.A. intended B. unexpected C. failed D. desired
17.A. eyes B. hands C. feet D. heart
18.A. Lost B. Dirty C. Broken D. Empty
19.A. around B. out C. in D. down
20.A. returned B. remained C. increased D. softened
高二英语完形填空中等难度题查看答案及解析
— When will the new bridge be completed?
— It is said that it _______ by the end of this year.
| A．will complete | B．will have been completed | C．is completed | D．will be completing |
高二英语单项填空简单题查看答案及解析