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    Can you remember a morning when you've woken up to the ring of your alarm clock and
wished you could stay in bed? You haven't slept well, your hair is a mess. Worse, you
can't stop yawning. Yawning is universal to humans and many animals. Cats, dogs and fish
yawn just like humans do! Yawning is an involuntary (无意识的,不自觉的) action during
which you open your mouth and breathe deeply. The average duration of a yawn is about 6
seconds.
    The purpose and cause of yawning are still a mystery. Scientists are not sure what
causes a yawn. People yawn when they are tired or bored, but they also yawn when they
aren't. There are many ideas explaining why we yawn.
    One idea is that yawning is a way for the body to become more alert by taking in more
oxygen. A yawn increases the heart rate, forces carbon dioxide out of the lungs and blood
stream, and brings oxygen to the brain. But one study showed that volunteers given a lot
of oxygen did not yawn any less than before, while those given a lot of carbon dioxide
did not yawn more.
    Another idea is that early humans used yawning as a form of communication. If one
decided it was time to sleep, they would tell the others by yawning and they would do it
in return to show they agreed.
    A third explanation comes from psychology professor Gordon Gallup of University at
Albany in New York. He said that as people yawn, they cool off their brains. "Brains are
like computers." he said. "They only operate efficiently and effectively when they're
cool. Many things connected to yawning, like being tired, make the brain hot, and yawning
can reduce the heat."
    Scientists have sent people into space, and created terrible nuclear weapons, but
there are lots of seemingly simple things, such as why we yawn, or hiccup, that they
can't figure out. Next time you are in class in the morning, let out a big yawn and watch
to see how many of your classmates yawn in response!
1. What's the purpose of the description of how bad you may feel when you're woken up in
    the morning?
[     ]
A. To explain why humans yawn.
B. To explain how humans start yawning.
C. To lead into the topic of yawning.
D. To complain about being woken up by the clock.
2. Which is not among the possible reasons for yawning mentioned in the passage?
[     ]
A. A way to show that you feel hot.
B. A way to get rid of carbon dioxide.
C. A way to cool off your brain.
D. A way to communicate.
3. In which situation are you likely to yawn?
[     ]
A. When you feel sleepy.
B. The weather is hot.
C. Someone else yawns near you.
D. When you breathe in a lot of carbon dioxide.
4. What can we learn from the passage?
[     ]
A. The real reason why humans and most animals yawn.
B. Hiccups are an involuntary human action similar to yawns.
C. The more an action can be studied, the easier it is to research.
D. Finding out why humans yawn should be easier than sending people into space.
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科目:高中英语 来源:海淀区高三年级第二学期期中练习·英语 题型:050

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  Harbour Cruises LTD.

  Dining, Sightseeing and Special Events

  Get on board to experience Vancouver from a different perspective (视角) . Join Harbour Cruises Ltd. for Vancouver's only guided tour of the inner harbour, the always popular dinner cruise, or a luncheon cruise through a quiet coastal mountain bay. Special event cruises are available throughout the year including during the yearly fireworks competition and December's Christmas Carol Ships. Harbour Cruises Ltd. is located next to world-famous Stanley Park.

  Dates of Operation: April-October and December

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  Directions: Drive west on Georgia and turn right at the lights at Denman Street. Take the #135 Stanley Park bus or walk west along Georgia for 15 minutes towards Stanley Park from downtown.

  Information: 604.688.7246

  Reservations: 1.800. 663.1500

  Website: www. boatcruises. com

  Email: tours@boatcruises . com

  #1, North Foot of Denman Street, Vancouver, BC V6G 2w9

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  Not sure where to start? The Lookout, which is high atop Harbor Center Tower, is your best first choice in Vancouver. Majestic cruise ships, mountains sprinkled with fresh snow and a west coast sunset are but a few highlights of this grand view. Drink your cappuccino, join a free guided tour, learn something new about Vancouver and enjoy the view!

  Dates of Operation: Open 365 days / year

  Seasonal Hours: Winter 9:00 am - 9:00 pm

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  Directions: Located downtown at the SeaBus and SkyTrain station.

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  Information and Reservations: 604.689.0421

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  Email: info@vancouverlookout. com

  555 West Hastings Street, Vancouver, BC V6B 4N4

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  Seasonal Hours: May 4-Sept 2 (11:00 am-4:30 pm)

  Christmas Hours: Nov 23-Dec 13 & Dec31-Jan 4 (12: 00-5:30 pm) and Dec 14-30 (12:00-8 : 00 pm) Closed Dec 24 & 25

  Directions: Take exit 33 from Hwy 1 to Canada Way. Follow the signs along the sidewalk to Deer Lake Park. 20 minutes from downtown Vancouver.

  Information: 604.293.6501

  Telephone: 604.293.6500

  Website: www. city. burnaby. cb. ca

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A.for the view of mountains

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科目:高中英语 来源:甘肃省兰州一中2012届高三上学期期末考试英语试题 题型:050

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[  ]

A.

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[  ]

A.

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A.

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     Money off your rented textbooks from TextbookRental.ca
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科目:高中英语 来源:江苏月考题 题型:阅读理解

阅读理解。
     Harbour Cruises LTD.
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     Get on board to experience Vancouver from a different perspective (视角). Join Harbour Cruises Ltd.
For Vancouver's only guided tour of the inner harbour, the always popular dinner cruise (乘船巡游), or a
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科目:高中英语 来源:0113 期中题 题型:阅读理解

阅读理解。
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