[单项选择]Investors in gambling ventures have found them _______


A. very difficult to handle
B. extremely profitable
C. to cause family problems
D. boring

[单项选择]Investors in gambling ventures have found them _______


A. very difficult to handle
B. extremely profitable
C. to cause family problems
D. boring

[单项选择]Why did Branson say "We're delighted to have them sailing with us in Australia's golden rivers"

[单项选择]Doctors have found that laughter
A. keeps down blood pressure.
B. has similar effects to physical exercise.
C. decreases the heart rate.
D. increases stress.

[单项选择]What is found to have close relationship with rapid increase in population
A. War between 2 countries.
B. Ways discovered to increase productivity.
C. Migration from a continent to another continent.
D. A new religion beginning to be accepted by people.

[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