题型:阅读理解 题类:常考题 难易度:普通
浙江省七彩阳光联盟2020届高三上学期英语期初联考试卷(含小段音频)
Most dog owners have probably been puzzled waiting for their dog to do its business. Instead of just finding a soft area of grass to go number two, they make a whole ritual(仪式) out of it, spinning in a circle before finally squatting(蹲下). Luckily, the ultimate pet owners' question may finally have been answered.
A few theories have circulated about why dogs might circle before pooping and most are similar to the reasons they spin before lying down. Trampling around in a circle would flatten the grass around, which would keep tall blades(叶片) from trapping their waste. Another explanation could be that they're scanning for snakes and predators before they become completely occupied.
But Czech researcher Hynek Burda didn't quite buy into those theories. Dogs evolved from wolves, which didn't need to worry much about tall grass. And if they were scanning their environment, keeping still to listen and sniff would be more effective than giving the area a quick once-over. Instead, Burda suggested that dogs spin to get a feel for the Earth's magnetic pull.
The Earth has a magnetic field around it protecting it from radiation from space, and some animals seem to use it to get a sense of where its North and South poles are. For instance, it's how birds know which way to migrate. In 2013, Burda published a study in the journal Frontiers in Zoology suggesting dogs have a strong internal compass, too. He and his team spent two years watching 70 dogs poop and pee and recording which way they faced and how strong the magnetic(磁的) field was.
As it turns out, when the magnetic field was calm, dogs preferred to poop facing either north or south.
The pattern couldn't explain why dogs like facing the Earth's poles, but the researchers think it might help them remember where they marked their territory.
If they can remember which way they were facing, they might find it easier to find that spot again. So before you roll your eyes when your dog takes ages to do his business, remember that Fido might just be getting scientific about his potty spot.
Family Fun in Canadian Museum of Nature
Bring the whole family to rediscover our fully redecorated museum.
WHAT TO SEE AND DO
Check out What's On for all the events, educational activities and HD movies happening during your visit. Care for birds, dive down into the depths at the helm (舵柄) of a research submersible(潜水器) or explore a cave… on the first floor. Don't miss our gallery play areas on the third floor when visiting with kids. By visiting here, your children will learn more about nature. Check out Our Exhibitions which present our special exhibitions and our galleries. Be sure to stop at our Nature Boutique on the second floor for a vast selection of games, books and nature-related souvenirs from 9:30 am until the museum closes for the day.
HOURS, ADMISSION, SERVICES AND MORE
Opening hours: Regular Hours (September 4 -May 31) 9 am-5pm except Monday and Thursday Summer Hours (June 1-September 2) 9 am-6 pm(Saturday-Wednesday) 9 am-8 pm(Thursday and Friday) |
General Admission: Free for members. Adult: $14.50 Senior (65+): $12.50 Student (18+): $12.50 Student (13+): $12.50 Child (3–12): $10.50 Tiny Tot (0–2): Free A general admission ticket is required—even when the price is free, as it is for members and Tiny Tots—if you want to see a movie or a special exhibition. Buy a combo that includes both tickets already. Ticket combo includes general admission and a 3D movie. Adult: $18.50 Senior (65+): $16.50 Student (18+): $16.50 Student (13+): $16.50 Child (3–12): $14.50 Tiny Tot (0–2): Free Member: $3 |
Parking: Paid parking is available on the Canadian Museum of Nature grounds. Rates: $3 per half hour maximum of $14 per day (until 4:30 am) evening flat rate: $5 (4:30 pm -4:30 am) Charges accumulate (evening and next day) for vehicles that are parked overnight. |
The Canadian Museum of Nature provides a host of information, images and videos on our websites about nature, such as http://www.nature.ca/en/family-fun and http://www.expeditionarctic.ca/.The museum also participates in several social networks. Follow us on Facebook, YouTube, Instagram and Twitter.
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