更多"Passage Two
Do you go to bed"的相关试题:
[单项选择]Passage Two
Do you go to bed without brushing your teeth You may think that not brushing is not a big deal. But caring for your mouth can prevent serious (and even embarrassing) problems.
Cavities happen to just about everyone. A cavity is a diseased spot in the tooth. It all starts with a sticky film made up of bacteria. That film coats your teeth and gums. The bacteria eat sugars from things you eat and drink. That produces acids. Then, the acids eat away at your teeth’s hard outer coating, called enamel.
If you don’t brush regularly to remove the film, or if you keep missing a spot, those acids keep eating away the teeth’s enamel. That is how you get a cavity. "The larger it gets, the closer it gets to the nerve, increasing the chance of severe pain," says Lynn Ramer, president of the American Dentists’ Association.
A cavity will never just go away by itself. It will only get worse. "Left untreated, 100 percent of the time a cavity will spread," says Dr.
A. a diseased spot in the tooth
B. a film of acids coating the teeth
C. a sticky film made up of bacteria
D. a hard outer coating covering the teeth
[填空题]Could you go to bed (early)（）than you usually do
[单项选择]Passage Two
Born without sight, 7-year-old Lucas Murray used to be so afraid of walking that he wouldn’t take a step without his parents. He wouldn’t walk on a bumpy surface.
But now, Lucas has become more mobile than his parents ever imagined, running with friends, playing basketball and jumping on a trampoline (蹦床)—all on his own.
The incredible change is owed to a technique called echolocation, similar to the method used by dolphins and bats, that allows Lucas to paint a picture of his surroundings using the sound he creates himself.
To "see" the world around him, he dicks his tongue and listens to the echo that bounces back. From the sound, he can make out the location, depth and shape of objects around him, allowing him to navigate (导航) even unfamiliar areas.
Though it’s estimated that only about 5% to 10% of the blind population now uses a sonar (声呐系 统)-type approach, the Murrays hope it could someday become as
A. walk on a bumpy road
B. draw pictures of things around
C. make sounds and respond to them
D. copy the sounds of bats or dolphins
[单项选择]
Why do people go to craft fairs rather than shopping at stores
A. Things in craft fairs have better quality than in stores.
B. They want to buy things that are different and original.
C. It is more convenient to buy things in craft fairs.
D. They can buy everything they want in craft fairs.
[填空题]When two of you do shopping together, you can be the best bargainer.
[单项选择]
Passage Four
Without question there are plenty of
bargains to be had at sales time—particularly at the top-quality shops whose
reputation depends on having only the best and newest goods in stock each
season. They tend, for obvious reasons, to be the fashion or seasonal goods
which in due course become the biggest bargains.
It is true that
some goods are specially brought in for the sales but these too can provide
exceptional value. A manufacturer may have the end of a range left on his hands
and be glad to sell the lot off cheaply to shops; or he may have a surplus of a
certain material which he is glad to make up and get rid of cheaply; or he may
be prepared to produce a special line at low cost merely to keep his employees
busy during a slack period. He is likely to have a good many "seconds"
available and if their defects are trifling t
A. have his goods produced at low cost
B. sell his goods at a very- low price
C. have his employees sell his goods
D. try to produce high quality goods
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