What makes us human？Is it our thoughts？Our emotions？Our behavior？
All of these things make us who we are，but at the center of it all lies the genome — the genes inside our bodies that determine everything from our hair color to our intelligence. But if we could change our genome，would we still be human？
Recently，a group of scientists from the US and South Korea worked together to successfully“edit”a human embryo（胚胎）and remove a genetic mutation（变异）that would have led to heart disease. This was achieved with the help of CRISPR-a gene — editing tool that allows scientists to edit the genome by cutting，changing or adding to parts of it.
Scientists involved in DNA editing are certain about the good of their work，and hope that in the future，diseases could simply be“edited out”.
However，others aren't so sure. People are worried that the science could be used not only to remove life-threatening illness，but also to make a“perfect”baby whose DNA has been chosen to improve its intelligence or other qualities. They say that this is a shallow way of thinking about raising children.
“It makes you think about who we are as people，and it makes you ask if humans should use the kind of power…that is changing human evolution（进化），”Jennifer Doudna of the University of California said.
Still，others worry that DNA editing could be turned into an expensive service that would only be available to the people who could afford it. That might mean the rich would be given another advantage in a world where they already have plenty of them.
“You could find wealthy parents buying the technology for their children, leading to even greater inequality than we already live with,”Marcy Darnovsky, director of the San Francisco Center for Genetics and Society, said.
【小题1】Why are the questions asked in Paragraph 1?
| A．To attract the readers' interest. |
| B．To seek answers from the readers. |
| C．To show those things aren't important. |
| D．To correct our understanding of human beings. |
【小题2】Which of the following will Jennifer Doudna most probably agree with？
| A．Having a perfect baby is not so good for the family. |
| B．Life-threatening illnesses should be removed before birth. |
| C．DNA editing might cause unexpected problems to humans. |
| D．DNA editing may enlarge the gap between the rich and the poor， |
【小题3】What does the underlined word“them”most probably refer to？
| A．Advantages. |
| B．Expensive services. |
| C．Perfect children. |
| D．Qualities |
【小题4】What's the author's attitude towards DNA editing？
| A．Disappointed. | B．Doubtful. |
| C．Positive. | D．Objective. |
