B. make others unhappy
C. tend to scold others openly
D. enjoy the pleasure of life
48. We can conclude from the passage that
A. we should pity all such unhappy people
B. such unhappy people are dangerous to social life
C. people can get rid of the habit of unhappiness
D. unhappy people can not understand happy persons
49. If such unhappy persons insist on keeping the habit, the author suggests that people should
.
A. prevent any communication with them
B. show no respect and politeness to them
C. persuade them to recognize the bad effects
D. quarrel with them until they realize the mistakes
50. In this passage, the writer mainly
.
A. describes two types of people
B. laughs at the unhappy people
C. suggests ways to help the unhappy
D. tells people how to be happy in life
C
An Australian-based scientist announced yesterday he had made a step forward in forensic (用于法庭的) DNA testing so that an individual can be identified by a single cell.
Ian Findlay, from the Australian Genome Research Facility at the University of Queensland, said current DNA testing required 200 to 500 cells to gain a similar level of accuracy. "What we have done has brought that down to one cell," Dr Findlay said after releasing details of his DNA testing technique at a Sydney conference.
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