Passage Two Questions 6 to 10 are based on the following passage. prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace> In the Science study, researchers from the University of Wisconsin at Madison, King's College in London, and the University of Otago in New Zealand analyzed the type of 5-HTT gene carried by 847 adults in New Zealand who were part of a long-term health study. There are two forms of the 5-HTT gene, the long and the short. An individual can inherit two copies of the long form, two of the short, or one of each. The researchers focused on subjects in the study who had had traumatic ( 有创伤的 ) life events over a five-year period. These events could include such things as a death in the family, a marriage breakup or the loss of a job. Patients with at least one copy of the short form of 5-HTT were more at risk of depression, the study found, suggesting that this form of the gene caused a heightened sensitivity to emotional stress. Patients with only the long 5-HTT gene were more resistant to depression following serious emotional events and tolerated stress better. Depression was diagnosed in about 33 percent of the study subjects who had at least one short 5-HTT gene copy and who had experienced four traumatic events over a five-year period. Among those with two copies of the long form of 5-HTT, only 17 percent were diagnosed with depression after four traumatic events. Researchers said tests showed that those with even one copy of the short 5-HTT gene were almost three times more likely to think or attempt suicide than those with only the long 5-HTT. Experts said the difference in the forms of the 5-HTT gene is not in the proteins they produce, but in the regulation of serotonin ( 血清素 ), a neurotransmitter that carries signals between nerve cells. The short version of 5-HTT is not as effective in controlling the serotonin flow as is the long version, he said. 6. The study on 5-HTT gene _____. A) was based on a five-year basis B) studied 847 men in New Zealand C) was carried out by New Zealand scientists D) focused on the insane people 7. The subjects of the study _____. A) were abnormal B) all suffered from emotional stress C) were from different countries D) had more short form of 5-HTT 8. The study showed that _____. A) the short form of 5-HTT caused stronger response to traumatic life events B) more subjects were very sensitive to any emotional stress C) there were three types of 5-HTT genes D) people with one long 5-HTT gene were the most resistant to depression 9. Subjects who had at least one short 5-HTT gene copy _____. A) were almost three times more likely to think or attempt suicide than those with only the long ones B) accounted for more than 30% of the subjects C) accounts for about 17% of the subjects D) were more sensitive to depression than those who had only the long ones 10. The study showed that the 5-HTT genes are different in _____. A) their weight B) the proteins they produce C) the regulation of serotonin D) the nerve cells