Identical twins possess exactly the same set of genes. Yet as they grow older,
they may begin to display subtle differences. They may start to look different,
develop different diseases or slide into different persons. 1.______
Women who are identical twins may differ with their fertility or 2.______
the age at which they reach menopause. These discrepancies
usually attributed to ill-defined differences in environment. 3.______
But a whole new level of explanation has been opened up by a generic survey 4.______
showing that identical twins, because they grow older, differ increasingly in 5.______
what is known as their epigenome. The term refers to natural
chemical modifications that occur in a person’s genome shortly before 6.______
conception and that act on a gene as a gas pedal or a brake, marking it for higher or lower activity. 7.______
Identical twins have the same set of epigenetic mark on the genome 8.______
when they are born. But differences in the epigenome disappear 9.______
as the twins grow older and become greater the longer they live together, 10.______
say a team of researchers led by Dr. Manel Esteller of the Spanish National Cancer Center in Madrid.

问答题Write an essay about 400 words, expressing your view on fake commodities. In the first part of your writing you should present your thesis statement and in the second part you should support the thesis statement with appropriate details. In the last part you should bring what you have written to a natural conclusion with a summary. Marks will be awarded for content, organization, grammar and appropriateness. Failure to follow the above instructions may result in a loss of marks. Write your composition on ANSWER SHEET FOUR.

问答题But the worst of it isn’t society’s work - ethic morality; it’s your own, which you never knew you had. You find out how much self- satisfaction was gained from even the most simple work related task: a well - worded letter, a well - handled phone Call even a clean fire. Being useful to yourself isn’t enough But then almost everyone has heard about the need to be a useful member of society. What you didn’t know about was the loneliness. You’ve spent your life almost constantly surrounded by people, in classes, in dorms and at work. To suddenly find yourself with only your cat to talk to an day distorts your sense of reality. You begin to worry that flights of fancy might become one way. But you always were, and still are, stronger than that. You maintain balance and perspective, mainly through resorting frequently to sarcasm and irrevence. Although something going wrong in any aspect of your life now seems to push you into temporary despair much more easily than before, you have done very important things to hang on to people who care, your sense of humor your talents, your cat and your hopes.

填空题because→as

填空题generic→genetic

填空题^usually attributed to→are