第三部分：阅读理解(共20小题;每小题2分，满分40分)
阅读下列短文，从每题所给的四个选项(A、B、C和D)中，选出最佳选项，并在答题卡上将该项涂黑。
A
Right in front of the Minneapolis Central Library，a row of green bikes sits parked in a special stand.Each bike is designed with the logo “Nice Ride”—the name of the city’s bike-share program.
Nice Ride bikes are a lot like the library books that people come here to borrow.To rent a bike，you simply use your membership card at a Nice Ride bike station.Members can rent one of 1,200 bikes from 138 stations throughout Minnesota's largest city.People use the Nice Ride bikes to go to work，to go out on business，or just to enjoy the city’s many bike paths.
The rise of bike-share programs like Nice Ride is encouraging more people than ever to choose biking over driving.Rising gas prices and concerns about the environment have also gotten people to dust off their bike helmets， pump air into flat tires，and hit the road.
Why ride? Not only is biking good exercise，but switching from a car to a bike also reduces the amount of pollution in the air.Carbon dioxide，a greenhouse gas linked to climate change，is one of the many polluting substances that come out of a car's tallpipe.
Bike-share systems are found around the world in cities like London，Paris，Barcelona，and Melbourne，Australia.The largest program-with 70,000 bikes-is in Wuhan，China.
To make roads friendlier to non-motorists，the U.S.Department of Transportation has invested more than a billion dollars in cycling and pedestrian projects in recent years.The money went toward building thousands of miles of on-street bike lanes and bike-and pedestrian-only passages called green ways.
56.If one wants to use the bike，it's a must to __________.
A.give away a bicycle B.know Nice Ride well
C.pay the cost in advance D.get a membership card
57. Which of the following can people do with the bikes?
A.Earn a living. B.Enjoy bikeways.
C.Compete in a race. D.Rent them out to others.
58.Paragraph 4 is mainly about _____________.
A.benefits of biking B. pollution caused by cars
C.methods to use the bikes D.ways to reduce pollution
59.Which of the following is true of Nice Ride?
A.It will take the place of taxi companies. B.China has better public bike systems.
C.It attracts more people to choose biking. D.The government lacks money to support it.
60.The author's purpose in writing this text is to ______________.
A.spread bike-share programs B.seek advice for Nice Ride
C.compare Nice Ride with libraries D.introduce the public bike system
B
A black hole is a place in space where gravity pulls so much that even light cannot get out. The gravity is so strong because matter has been squeezed into a tiny space. This can happen when a star is dying.
Because no light can get out, people can’t see black holes. Space telescopes with special tools can help find black holes. The special tools can see how stars that are very close to black holes act differently from other ones.
Black holes can be big or small. Scientists think the smallest black holes are as small as just one atom. These black holes are very tiny but have the mass of a large mountain. Mass is the amount of matter, or “staff”, in an object.
Another kind of black hole is called “stellar”(星球黑洞). Its mass can be up to 20 times more than the mass of the sun. There may be many stellar mass black holes in Earth’s galaxy. Earth’s galaxy is called the Milky Way.
The largest black holes are called “supermassive”(超大质量黑洞). These black holes have masses that are more than one million suns together. Scientists have found proof that every large galaxy contains a supermassive black hole at its center. The supermassive black hole at the center of the Milky Way galaxy has a mass equal to about four million suns and would fit inside a very large ball that could hold a few million Earths.
Scientists think the smallest black holes formed when the universe began. Stellar black holes are made when the center of a very big star falls in upon itself, or falls apart. When this happens, it exploded part of the star into space. Scientists think supermassive black holes were made at the same time as the galaxy they are in.
A black hole can not be seen because strong gravity pulls all of the light into the middle of the black hole. But scientists can see how the strong gravity affects the stars and gas around the black hole. Scientists can study stars to find out if they are flying around, or orbiting a black hole.
When a black hole and a star are close together, high-energy light is made. This kind of light cannot be seen with human eyes. Scientists use satellites and telescopes in space to see the high-energy light.
61. The gravity of a black hole may become so strong that light cannot get out when ____________.
A. the star is going to die B. special tools are used on it
C. other stars come close to it D. it is seen from the space telescopes
62. According to the passage, which of the following is NOT true?
A. A black hole can be very tiny but extremely heavy.
B. The gravity of a black hole holds all light in its center.
C. Scientists observe high-energy light through their own eyes.
D. Some small black holes came into being as early as the universe.
63. Which can be inferred from the passage?
A. Every galaxy must have a black hole. B. A galaxy is the center of the universe.
C. A galaxy consists of a large group of stars and planets. D. Earth’s galaxy is called the Milky Way.
64. What does the last sentence in Paragraph 5 suggest?
A. Neither the sun nor the earth is as heavy as a black hole.
B. There is only one supermassive black hole at the center of the Milky Way.
C. The supermassive black hole had existed before the Milky Way was formed.
D. There is a reason why the large black holes are called “supermassive”.
65. The last two paragraph mainly focus on the question of _________.
A. what a black hole is B. how black holes form
C. how big black holes are D. how scientists know about black holes
