Scientists have developed a non-stick chewing gum(口香糖). The new gum can     (remove) easily from pavements, shoes and clothes. It’s the result of polymer (聚合体) research at the University of Bristol and could be launched commercially in 2008.      it catches on(流行), the product will solve      major headache for present authorities around the world.

“A great     (disadvantage) of our Clean Gum is that it is easy to remove and has the potential to be    (environment) degradable (可降解的),” said Terence Cosgrove, a professor of chemistry      helped to found a company called Revolymer to commercialize the technology.

Today’s chewing gums are made   synthetic latex(人工制造的乳液), which is resistant to the weather and is strongly sticky. The new gum adds a special polymer to change its properties(特性),       (make) it far less sticky.

In two street trials,       commercial gums remained stuck to the pavement        Clean Gum came away naturally in all cases.

Scientists have developed a non-stick chewing gum(口香糖). The new gum can   1. (remove) easily from pavements, shoes and clothes. It’s the result of polymer (聚合体) research at the University of Bristol and could be launched commercially in 2008.   2.  it catches on(流行), the product will solve  3.  major headache for present authorities around the world.

“A great 4.  (disadvantage) of our Clean Gum is that it is easy to remove and has the potential to be 5. (environment) degradable (可降解的),” said Terence Cosgrove, a professor of chemistry  6.  helped to found a company called Revolymer to commercialize the technology.

Today’s chewing gums are made  7.synthetic latex(人工制造的乳液), which is resistant to the weather and is strongly sticky. The new gum adds a special polymer to change its properties(特性),    8.  (make) it far less sticky.

In two street trials,   9.  commercial gums remained stuck to the pavement   10.    Clean Gum came away naturally in all cases.

Most schools forbid chewing gum(嚼口香糖), but in a few years they might consider changing that rule. Why? Scientists are finding evidence that gum chewing may be good for your health. It may even help improve your test scores. This exciting research is just beginning. And in the meantime, companies are also experimenting with adding vitamins, minerals, medicines, and other substances that could give gum the power to cure headaches and fight everything from serious diseases to bad breath.
Other researchers are finding that gum might work better than a pill to deliver medicines and other substances into the bloodstream. That’s because the lining (膜) of our cheeks can absorb certain substances more quickly than our stomachs and intestines (肠) can. That discovery could help other researchers develop medicine-containing gums that fight colds, ease headaches, battle nervousness, and
more. Scientists might even create anti-microbial (抗菌的) gums that cure bad breath.
Those projects may take years, but gum scientists have already had at least one recent success: They’ve created a gum that could help us stay awake. Researchers have produced a gum called Stay Alert. Each stick has as much caffeine as a cup of coffee. It can take an hour for the caffeine in coffee to have its full effect, but the caffeine in Stay Alert hits in just a few minutes. The gum is easy to transport and it’s stable in cold and hot climates. Unlike a pill, it doesn’t require water to swallow. Those qualities make it easy for soldiers to use. For now, Stay Alert is available only to the military (军队). The manufacturer may one day offer it for sale to the public. People who work at night, such as truck drivers and medical personnel who ride in ambulances, might benefit from a product like Stay Alert.
【小题1】The passage mainly talks about _____.

Most schools forbid chewing gum(嚼口香糖), but in a few years they might consider changing that rule. Why? Scientists are finding evidence that gum chewing may be good for your health. It may even help improve your test scores. This exciting research is just beginning. And in the meantime, companies are also experimenting with adding vitamins, minerals, medicines, and other substances that could give gum the power to cure headaches and fight everything from serious diseases to bad breath.

Other researchers are finding that gum might work better than a pill to deliver medicines and other substances into the bloodstream. That’s because the lining (膜) of our cheeks can absorb certain substances more quickly than our stomachs and intestines (肠) can. That discovery could help other researchers develop medicine-containing gums that fight colds, ease headaches, battle nervousness, and

more. Scientists might even create anti-microbial (抗菌的) gums that cure bad breath.

Those projects may take years, but gum scientists have already had at least one recent success: They’ve created a gum that could help us stay awake. Researchers have produced a gum called Stay Alert. Each stick has as much caffeine as a cup of coffee. It can take an hour for the caffeine in coffee to have its full effect, but the caffeine in Stay Alert hits in just a few minutes. The gum is easy to transport and it’s stable in cold and hot climates. Unlike a pill, it doesn’t require water to swallow. Those qualities make it easy for soldiers to use. For now, Stay Alert is available only to the military (军队). The manufacturer may one day offer it for sale to the public. People who work at night, such as truck drivers and medical personnel who ride in ambulances, might benefit from a product like Stay Alert.

1.The passage mainly talks about _____.

A. the rule of forbidding chewing gum in school

B. new research on chewing gum

C. different kinds of chewing gum

D. the relationship between chewing gum and medicine

2.What does the underlined word “hits” in Paragraph 6 probably mean?

A. Touches.       B. Attacks.     C. Takes effect.            D. Affects badly.

3.According to the passage, Stay Alert is a gum which can help people _____.

A. stay awake                     B. fight colds    

C. cure headaches                 D. overcome nervousness

4.It can be inferred from the passage that _____.

A. stay Alert is not easy to store           

B. stay Alert needs water to swallow

C. stay Alert is available to the public now 

D. we can’t buy gums which cure bad breath now

完形填空

　The habit of chewing gum（咀嚼口香糖）has lasted for more than a century．Millions of people all 　1 　the world chew billions（兆）of pieces of gum every year．

　Chewing gum 　2 　popular in the United States mainly 　3 　of the work of one man, William Wrigley, 　4 　for many years was the head of the Wrigley Company． 　5 　Thomas Adams first began his experiment in about the 　6 　1870．It was he who first 　7 　the gum softer and more pleasant to chew．But it was not until Wrigley joined the 　8 　in about 1890 that people everywhere began to 　9 　up the habit of chewing gum．　

　Wrigley liked to do 　10 　in a big way．In his first year, he borrowed money and 　11 　more than a million dollars in advertising(做广告)．For years, there 　12 　a large Wrigley's advertisement on every streetcar in the United States． 　13 　complained(抱怨)that they could not go 　14 　without seeing Wrigley's name． Wrigley even 　15 　, free of charge, States．Finally he began to advertise that it was good for health to chew gum, that it 　17 　the nerves(神经), and that it helped to keep the teeth clean．

　He 　18 　give the gum free to every child in the United States on 　19 　second birthday．He employed（雇佣）young 　20 　who,in long, orange-striped（有桔色条纹的）dresses would go from city to city in groups of 　21 　or five, stand at street corners and give free samples(货样) of chewing gum to every person who passed by． 　22 　this way each woman gave away about five thousand 　23 　of wrigley's gum every day．As 　24 　of this 　25 　advertising, people in the United States began to buy more and more chewing gum．