Cities such as New York, Washington, Boston and San Francisco have launched bike-share programs to ease traffic jam, improve public health, and cut carbon emissions (排放). Cyclists in those cities tend to choose bike-sharing to make their trips to office or home faster, cheaper, and more fun. Last year, U.S. bike-share riders completed nearly 46 million trips—more than twice as many trips from the previous year.
Yet despite these programs’ advantages and popularity, there are still huge challenges. Take, for instance, the distribution (分布) of bikes. The living area face shortages of bicycles in the morning rush, while business districts do not have enough bikes in the evening. What’s more, parking places can be full at certain hours, making it difficult for riders to return the bikes once they’ve reached their destinations.
Solving this problem is not easy. David B. Shmoys and his colleagues set out to develop complex algorithms(算法) and advanced analytics(逻辑法) to solve the challenges of bike-share operations.
One area in which the methods were applied was the Bike Angels program. As part of the program, cyclists can be rewarded with points by renting or returning bikes at certain high-need stations. Today, Bike Angels accounts for roughly 30 percent of bike rebalancing in New York City. It has greatly improved customer satisfaction which, in turn, has more riders. And more importantly, this form of rebalancing comes with a much less carbon emissions, because less box trucks are needed to move the bikes!
David B. Shmoys and his colleagues applied algorithms and analytics to solve other problems, too. However, they can not solve every new transportation problem. They have many limitations, including incomplete information. That is, David B. Shmoys and his colleagues only observe the realized rentals (returns) at stations at which bikes were available, not those that were blocked due to the imbalance of the system.
1.Which is not one of the advantages of bike-share program?
A.It helps people save money.
B.It helps improve the air quality.
C.It provides more bikes for cyclists.
D.It helps people build up their bodies.
2.What is mainly talked about in paragraph 2?
A.Riders do not want to return the bikes.
B.The distribution of bikes is a big problem.
C.People do not have enough bikes in the morning.
D.The bike-share program is very popular in New York.
3.What do we know about the Bike Angels program?
A.It had more users due to the algorithms.
B.It increased the use of box trucks.
C.It awarded riders cash for renting bikes.
D.It re-balanced all the bikes in New York.
4.What does the underlined word “they” in the last paragraph probably refer to?
A.other problems
B.carbon emissions
C.algorithms and analytics
D.Transportation problems
Thailand's southern beaches attract travelers with their clean water and dramatic cliffs (峭壁), but there's more to explore in this Southeast Asian country.
Lopburi for history buffs
Bypass the tour groups at the ancient city of Ayutthaya and head two hours north of the capital, Bangkok, for a peaceful walk through Thai history. Lopburi, one of Thailand's oldest cities, boasts Khmer-era temples and the uncrowded ruins of King Narai's Palace, which was built in the 1600s. It's also known for the monkeys that gather at Phra Prang Sam Yot temple in the center of town.
Ban Krut for beach bums
In Ban Krut, travelers will find one of the cleanest and quietest stretches of white sandy beach within driving distance of Bangkok. This sleepy seaside community, known mostly by locals, is a five-hour drive or six-hour train trip down the Gulf of Thailand. Don't miss the magnificent Wat Tang Sai, a huge, fairy tale castle-like Buddhist temple.
Cave for holiday hikers
Hiking trails, wetlands and forests make Khao Sam Roi Yot National Park a weekend adventure worthy of topping your Thailand to-do list. The park's crown jewel is the extraordinary Phraya Nakhon Cave. Come early to catch the picturesque chamber flooded with morning sunshine that spotlights the royal pavilion that sits inside.
River Kwai for nature lovers
Most visitors come for the beaches, but the rivers and parks in Thailand's Kanchanaburi province have much to offer. Scenic trails and waterfalls abound in Sai Yok and Erawan national parks. Just two hours from Bangkok is the bridge made famous in the book Bridge over the River Kwai by French author, Pierre Boulle, and the 1957 Academy Award-winning 1957 film adaptation of the same name. Stay on the river at one of Kanchanaburi's many floating hotels, where you can travel to your front door.
1.From which of the following can you learn more about Thai history?
A.Ban Krut
B.Kanchanaburi
C.Phraya Nakhon Cave
D.Lopburi
2.What can tourists do in Khao Sam Roi Yot National Park?
A.Visit temples.
B.Meet lovely monkeys.
C.Go hiking.
D.Go to the beach.
3.What can we know from the passage?
A.River Kwai was made famous by a book and a film
B.Tourists can stay at the floating hotels on River Kwai.
C.Most visitors visit Thailand for rivers and parks
D.Travellers can find Khmer-era temples in Ban Krut.
假如你是李华，你所在的城市要举行运动会，组委会现征集志愿者。请给组委会负责人王先生写一封信，申请成为一名志愿者。要点如下：
1.个人情况；
2.为什么申请当志愿者；
3.你将如何当好这个志愿者。
1.词数100左右；
2.可以适当增加细节，以使行文流畅；
3.开头及结尾已给出，不计入总词数。
Dear Mr.Wang，
_________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
Looking forward to hearing from you.
Yours,
Li Hua
单词拼写
1.The young man decided to find a ___________（临时的）job to support his family.
2.When I walked past him, he stood there, ___________（假装）not to see me.
3.The medical team c___________of over 20 people was sent to that poor area.
4.My mother was satisfied with the coat p___________（购买）from the Internet.
5.Seeing the long snake, the little girl was too t___________to walk any farther.
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。
If you get injured in a sport, what should you do? The best way 1.（deal）with sports injuries is to keep them from happening in the first place. Knowing the rules of the game and using the right2.（equip）can help you preventing injuries. If you’ve got injured，pull 3.（you）out the game or stop doing your activity.Let a coach or parent know what4.（happen）in case you need to see a doctor.Serious head and neck injuries happen most often in athletes 5.play sports like football.Keep the injured person still with his or her head 6.（hold）straight while someone calls for medical help.If the person 7.（lie）on the ground, do not try to move him or her.
Your first question after a sports injury will 8.(probable) be, “When can I play again?” This depends on the injury and 9. your doctor tells you. Even if you can’t return to your sport right away,a doctor might have advice on what you can do to stay healthy. Always talk with your doctor10. trying any activity following an injury.
One day, I saw a small poster across the room, which read, “In order to help others，I must help myself first.” I can’t_______where I got it, but the poster has always been there.I didn't take notice of it before, but this time，I felt something_______
Somehow in my mind there often_______pictures from a documentary（记录片）, which I saw several days ago about the lives of_______children in Palestinian refugee camps（难民营）.Their living_______are so poor.They live in overly crowded_______without electricity or fresh water supply.Schools are_______a luxury（奢侈）for many children._______can tell when it will end.They surely need a helping hand.
I sincerely hope that there will be some helping hands which can give hope to these children_______they can start to appreciate a good and________world. At that moment,I________that the joining of many helping hands must start with one helping hand and that was mine. But how do I go about doing this?I was silently lost in my own________.
“What are you thinking?” My silence was________by my dad. I asked him, “How can I be a helping hand?” He________a deep breath. Then he said, “To be a helping hand,________, you have to be successful in whatever you________to be.”
He walked out of the room and soon came back with a________in his hands. He handed it to me and said,"Spend some time reading this and________you will understand what I meant."After spending the whole day reading the book,I realized that “in order to help others,I must help myself first” has a deeper-rooted________. Helping myself means I have to be________so that I can help others with my helping hands.
1.A.imply B.admit C.remember D.suggest
2.A.exciting B.strange C.different D.similar
3.A.appear B.exist C.stand D.arrive so
4.A.dishonest B.careless C.public D.helpless
5.A.houses B.conditions C.positions D.rights
6.A.castles B.tents C.classrooms D.trees
7.A.placed B.named C.considered D.read
8.A.Anybody B.Nobody C.Somebody D.Everybody
9.A.as if B.in case C.even though D.so that
10.A.thoughtful B.caring C.quiet D.deep
11.A.agreed B.minded C.realized D.appreciated
12.A.thoughts B.ideas C.dreams D.eyes
13.A.broken B.settled C.killed D.destroyed
14.A.lost B.felt C.heard D.took
15.A.all of a sudden B.first of all C.as a result D.at the end
16.A.dislike B.desert C.choose D.learn
17.A.poster B.book C.pen D.picture
18.A.hopefully B.personally C.generally D.crazily
19.A.opinion B.cause C.impression D.meaning
20.A.practical B.demanding C.successful D.generous
