Exposing for long periods to the video screen causes disturbances to vision and ______.

fic fumes on the brain. As roadways choke on traffic, researchers suspect that the tailpipe exhausted【M1】______ from cars and trucks—especially tiny carbon particles already implicated heart disease, cancer and respiratory ailments—may【M2】______ also injure brain cells the key to learning and memory. New【M3】______ public-health studies and laboratory experiments suggest that, at every stage of life, traffic fumes exact a measuring toll on mental【M4】______ capacity, intelligence and emotional stability. Children in areas affected by high levels of emissions, on average, scored more poor on intelligence tests and were more【M5】______ prone to depression, anxiety and attention problems than children growing in cleaner air, separate research teams in New York,【M6】______ Boston, Beijing, and Krakow, Poland, found. And older men and women long exposing to higher levels of traffic-related particles【M7】______ and ozone had memory and reasoning problems effectively added【M8】______ five years to her mental age, other university researchers in Boston【M9】______ reported this year. The emissions may also height the risk of【M10】______ Alzheimers disease and speed the effects of Parkinsons disease. "The evidence is growing that air pollution can affect the brain," says medical epidemiologist Heather Volk at USCs Keck School of Medicine. "We may be starting to realize the effects are broader than we realized."

【M1】

A.exploring

B.exploding

C.exposing

D.exploiting

minals？

A．To arrest and bring them to justice under Canadian law.

B．To arrest and send them back to their countries of origin.

C．To do nothing except exposing their information to the public.

D．To further investigate their identities and then arrest them.

The author feels that the job of a journalist is rewarding in that______.

A．experienced journalists can still draw handsome salaries

B．it's a job that can satisfy people with enormous egos

C．he can fulfill his moral duty by exposing corrupt and lying politicians

D．he can raise the awareness of politicians and government officials to public opinion

d the hierarchical distinction between art and theory？

A．Theirs is a sterile, abstract practice, unlikely to produce few lasting works.

B．They have demonstrated that critics are less important to the art-making process than the public commonly believes.

C．They have laudably focused their energy on exposing the extent to which theory informs their own practice.

D．They have, to the detriment of their work, lost track of inner realm of the creator.

E．They have demonstrated a positive alternative to critics who have abandoned their field to become artists.

Forty May Be the New 30 As Scientists Redefine Age

Is 40 really the new 30？ In many ways people today act younger than their parents did at the same age.

Scientists have defined a new age concept and believe it could explain why populations are aging, but at the same time seem to be getting younger.

Instead of measuring aging by how long people have lived, the scientists have factored in how many more years people can probably still look forward to.

"Using that measure, the average person can get younger in the sense that he or she can have even more years to live as time goes on," said Warren Sanderson of the University of New York in Stony Brook.

He and Sergei Scherbov of the Vienna Institute of Demography (人口统计学) at the Austrian (奥地利的) Academy of Sciences, have used their method to estimate how the proportion of elderly people in Germany, Japan and the United States will change in the future.

The average German was 39.9 years old in 2000 and could plan to live for another 39.2 years, according to research reported in the journal Nature on Wednesday.

However, by 2050 the average German will be 51.9 years old and will be expected to live another 37.1 years. So middle age in 2050 would occur at around 52 years instead of 40 years as in 2000.

"As people have more and more years to live they have to save more and plan more and they effectively are behaving as if they were younger," said Sanderson.

Five years ago, the average American was 35.3 years old and could plan for 43.5 more years of life. By 2050, the researchers estimate it will increase to 41.7 years and 45.8 future years.

"A lot of our ski/Is, our education, our savings and the way we dear with our health care depend a great deal on how many years we have to live," said Sanderson.

This dimension of how many years people have to live has been completely ignored in the discussion of aging so far.

People 40 years of age today seem to be as young as______.

A．their parents were at the same age.

B．their parents were at the age of 30.

C．their children will be at the same age.

D．their children will be at the age of 30.

A.circumstance

B.confidence

C.covers

D.current

E.deals

F.different

G.exposing

H.fastl

根据下列文章,请回答 51～65 题。

Study Confirms Red Meat Link with Bowel(结肠)Cancer

People who eat more than l60 grams of red or processed meat a day are 35 percent more likely to develop bowel cancer than those who eat less___________ (51)20 grams a day。according to one of the biggest nutrition investigations ever carried out．

The European Prospective Investigation into Cancer and Nutrition followed 478，040 men and women___________ (52)35 t0 70 from 10 European countries．

All subjects were free of cancer at enrollment between 1992 and 1998，but ___________ (53)an average follow—up of almost 5 years 1，329 bowel cancers had been

The subsequent analysis，published in the Journal of the National Cancer institute，confirms the long—held suspicion___________ (54)high intakes(纳入量)of red meat are associated with increased bowel___________ (55)risk．

After taking into consideration factors like age，sex，height，weight，energy intake，physical activity，smoking，and alcohol consumption，the investigators found that bowel cancer was ___________(56)with intake of red and processed meat but not chicken．

Risk of bowel cancer dropped with increasing intake of fish．Eating more than 80 grams a day of fish was associated___________ (57) a 31 percent reduction in risk compared with eating less than l o grams a___________ (58)。

Subjects with high red meat and low fish intake were at 63 percent higher risk of bowel cancer compared with subjects with low red meat and high fish___________ (59) addition，the risk of developing the disease was increased for___________ (60)people who ate a lowlier diet Sheila Bingham，study investigator at the UK's Medical Research Council nutrition unit，said：“People have suspected for some time that high levels of red and processed meat___________ (61)risk of bowel cancer，but this is one of the largest studies worldwide and the first from Europe of this type to show a___________ (62)relationship．”

She added in a statement：“The overall picture is very consistent for red and processed meat and fibre across all the___________(63)populations studied．”

Study coordinator，Elio Riboli，of the World Health Organization International Agency for Research into Cancer，said：“0ther risk factors for___________(64)cancer．include．

obesity(肥胖)and lack of physical activity．Smoking and excess alcohol may also play a___________ (65)．These factors were all taken into account in the analysis．”

第 51 题

A．from

B．than

C．between

D．among

A.LDPE

B.OPP/PE

C.PE/OPP/PE

D.OPP/PVDC/PE/CPP

pulmonary embolism (PE)