[单项选择]While researchers may not ______ the expansive claims of hard-core vitamin enthusiasts, evidence suggests that the nutrients play a much more complex role in assuring vitality and optimal health than was previously thought.
A. authorize
B. license
C. counteract
D. endorse

[单项选择]While researchers may not ______ the expansive claims of hard-core vitamin enthusiasts, evidence suggests that the nutrients play a much more complex role in assuring vitality and optimal health than was previously thought.
A. authorize
B. license
C. counteract
D. endorse

[单项选择]While researchers may not______the expansive claims of hard-core vitamin en thusiasts, evidence suggests that the nutrients play a much more complex role in assuring vitality and optimal health than was previously thought.
A. authorize
B. license
C. counteract
D. endorse

[单项选择]While people may refer to television for the latest news, it is unlikely that television（）the newspaper completely.
A. replaced
B. replace
C. have replaced
D. will replace

[单项选择]While people may refer to television for up-to-the-minute news, it is unlikely that television（）the newspaper completely.
A. replaced
B. have replaced
C. replace
D. will replace

[单项选择]While it may sound ______ , I think you will soon experience the improvement of your ability by concentrating more on this lecture.
A. indicative
B. presumable
C. interesting
D. exaggerated

[单项选择]Researchers______ that genes may determine the strength of the immune system which could help explain how an infectious disease could have a hereditary link.


A. speculate
B. estimate
C. evaluate
D. anticipate

[单项选择]While many people may refer to up-to-minute news， it is unlikely that television and the Internet ____ the newspapers completely.
A. will replace
B. replace
C. are replacing
D. have replaced

[单项选择]Researchers from developing countries have gathered ______ the effects of recent increases in air pollution.
A. analyst
B. analysis
C. analyze
D. to analyze

[单项选择]Researchers at the University of Illinois determined that the （） of a father can help improve a child's grades
A. involvement
B. communication
C. interaction
D. association

[单项选择]Researchers discovered that plants infected with a virus give off a gas that （） disease resistance in neighboring plants.
A. contracts
B. maintains
C. prescribes
D. activates

[单项选择]Alternatively, researchers seeking access to identifiable, records or specimens can use "expedited" IRB review, in which one board member is ______ to rapidly approve such studies.
A. controlled
B. enrolled
C. enlisted
D. authorized

[单项选择]Researchers have studied the connection between aspirin and heart disease for _______.


A. more than a century
B. more than ten years
C. more than one year
D. a few years

[单项选择]

British cancer researchers have found that childhood leukaemia is caused by an infection and clusters of cases around industrial sites are the result of population mixing that increases exposure. The research published in the British Journal of Cancer backs up a 1988 theory that some as yet unidentified infection caused leukaemia--not the environmental factors widely blamed for the disease.
"Childhood leukaemia appears to be an unusual result of a common infection," said Sir Richard Doll, an internationally-known cancer expert who first linked tobacco with lung cancer in 1950. "A virus is the most likely explanation. You would get an increased risk of it if you suddenly put a lot of people from large towns in a rural area, where you might have people who had not been exposed to the infection." Doll was commenting on the new findings by researchers at Newcastle University, which focused on a cluster of leukaemia cases around the Sellafield nuclear repro
A. medical journal
B. research institute
C. private company
D. governmental agency