[单项选择]The Japanese scientists have found that scents ______ efficiency and reduce stress among office workers.
A. enhance
B. amplify
C. foster
D. magnify

[单项选择]Up to now scientists have not found how to ______ patients of that disease.
A. cure
B. treat
C. deal with
D. get rid of

[单项选择]Up to now scientists have not found how to（）patients of that disease.
A. cure
B. treat
C. deal with
D. get rid of

[单项选择]British scientists have found how to diagnose the disease, which causes loss of memory and personality change.
A. control
B. determine
C. prevent
D. treat

[单项选择]Now scientists have found in the past few years ______ .


A. the exposure of DNA to the public is unnecessary
B. the tiny cell in DNA is a neat little machine
C. mart knows nothing about DNA
D. man has much to learn about DNA

[单项选择]Scientists have found that there are four levels of sleep, each _____ a little deeper than the one before.
A. is
B. was
C. being
D. to be

[单项选择]It's reported that scientists have found __________ proof of early men in Afric


A. A． commonplaceB. authenticC. tentativeD. marginal

[单项选择]

A study by scientists in Finland has found that mobile phone radiation can cause changes in human ceils that might affect the brain, the leader of the research team said.
But Darius Leszczynski, who headed the g-year study and will present findings next week at a conference in Quebec(魁北克), said more research was needed to determine the seriousness of the changes and their impact on the brain or the body.
The study at Finland’s Radiation and Nuclear Safety Authority found that exposure to radiation from mobile phones can cause increased activity in hundreds of proteins in human cells grown in a laboratory, he said.
"We know that there is some biological response. We can detect it with our very sensitive approaches, but we do not know whether it can have any physiological effects on the human brain or human body," Leszczynski said.
Nonetheless the study, the initial findings of which were published last month in the scientific journal
A. Mobile phone radiation can increase protein activities and such activities can make the protective shield more permeable.
B. Mobile phone radiation can shrink the blood vessels and prevent blood from flowing smoothly.
C. Mobile phone radiation will bring stress to people exposed to it.
D. Mobile phone radiation kills blood cells at a rapid speed.

[单项选择]Scientists and experts have proved that the pattern of a human being's finger skin ______.