the Randall Museum, Corona Heights
Dog Park offers pets and owners breathtaking views, after a steep hillside climb, and a fenced dog area that allows dogs to let loose without a leash（狗链）. Owners will also enjoy the playground, tennis courts and basketball courts.
◆ Dolores Dog Park
The grounds of Dolores Park once served as camps for those who were left homeless by the 1906 earthquake, but now often visited by crowds of Mission District people. Four-legged friends can also wander about carefree off-leash while making friends with other members of the doggie community.
◆ Pine Lake Dog Park
Noteworthy for its place as a rest stop for hundreds of species of birds to fly to and from warmer climates, Pine Lake Park is also prized by city dogs and their owners for their nice hiking paths, picturesque lake suited for swimming, and an off-leash area on the park's west end that lets dogs run free.
◆ Buena Vista Dog Park
At 146 years young, Buena Vista Park is San Francisco’s oldest park. Dogs and owners with plus energy will love burning it on this park’s steep paths and winding staircases. Dog owners should have good control over their dogs, as it’s quite easy for dogs to get separated when going through Buena Vista’s many twists and turns.
21. Why do dog owners take their pets to Dolores Dog Park?
A. To let them socialize.
C. To help them lose weight. activities.
D. To increase their physical B. To give them rescue lessons.
22. Which dog park is popular with bird lovers?
A. Corona Heights Dog Park.
C. Pine Lake Dog Park.
23. What is special about Buena Vista Dog Park?
A. It is suitable for swimming.
B.
D. Buena Vista Dog Park. B. Dolores Dog Park.
It is close to a museum. C. Dogs must be on a leash.
Dogs can go climbing.
B
When Gitanjali Rao shared how she likes “finding solutions to real problems”, it was hard to imagine this dynamic 11-year-old girl could settle a problem that has escaped scientists for years.
In just three months, Rao came up with a device（装置）that can replace the costly and lengthy tests currently
used to reliably determine lead levels in our fresh water. Inspired by the current litigation （诉讼）in Flint, Michigan, a case of water pollution from 2014 to 2015, Rao designed a new testing system that resulted in her being named America’s Top Young Scientist for 2017.
Rao had been following the water problem for about two years. She was amazed by the number of people affected by lead pollution in water and wanted to do something to change this. Gitanjali spent months trying to convince local high schools and colleges to give her lab time to continue her experiment. At home, Gitanjali worked on her project in the “science room” she asked her parents to create for her. Rao has created a device that uses three
parts: a cartridge, a Bluetooth reader and an app. To put it simply, the cartridge contains carbon nanotubes（纳米管）
D.
that react to lead. This reaction is then registered by the Bluetooth reader, which sends a signal to a mobile app that can tell you immediately if your water is safe to drink.
Rao appropriately named the device Tethys after the Greek goddess of fresh water, and is hoping to make a little improvement to get the device on the market. While we may not be aware of any lead pollution present in our aging pipelines, lead poisoning can cause delays in physical and mental development. With Rao believing that the “purpose of science is to make a difference”, her incredible invention could make a difference to millions of people in the United States. 24. What do we know about Rao’s device?
A. It’s cheap and quick.
C. It’s expensive and reliable. time-consuming.
25. What made Rao have the idea of designing the device? A. Her parents’ suggestions.
B. The name of the Greek goddess.
C. Her interest in settling real problems. D. The water pollution
D. It’s portable and
B. It’s cheap and inaccurate.
litigation in Flint.
26. What do the carbon nanotubes function as? A. Sending immediate signals. B. Recording the reaction results. C. Detecting the presence of lead.
D. Showing the water quality results.
27. What does the author think of Rao’s invention?
A. It will lead Rao to make a fortune.
B. It will help millions of Americans drink safe water.
C. It will promote the
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