更多"Researchers discovered that plants "的相关试题:
[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. activates
C. maintains
D. prescribes
[单项选择]Research discovered that plants infected with a virus give off a gas that______ disease resistance in neighboring plants.
A. contracts
B. activates
C. maintains
D. prescribes
[单项选择]Researchers have discovered in recent years that there is a system to the actions almost as consistent and______ as language.
A. comprehensive
B. comprehensible
C. observant
D. conceivable
[单项选择]What have astronomers recently discovered
A. there are unknown plants in older galaxies.
B. there are many galaxies in the universe
C. there are a lot more red dwarf in older galaxies
[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]Christopher Columbus discovered the North American continent in ______.
A. 1592
B. 1620
C. 1492
D. 1420
[单项选择]Whose tomb was discovered in 1922
[单项选择]Hikers and campers often become infected by drinking water from ______ streams.
A. configured
B. insulted
C. contaminated
D. condemned
[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]The main purpose of these researchers is
A. to help to destroy old cells and boost new ones.
B. to alter the natural process known as apoptosis.
C. to compare different levels of proteins.
D. to find out ways to protect aging brain cells.
[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. Most people believe childhood leukaemia is due to environmental factors.
B. Population mixing best explains the cause of childhood leukaemia.
C. Radiation has nothing to do with childhood leukaemia.
D. Children born in a large town are at higher risk of leukaemia.
