14年六月英语_六级真题冲刺.doc

Reading Comprehension (40 minutes) Section A It was 10 years ago, on a warm July night, that a newborn lamb took her first breath in a small shed in Scotland. From the outside, she looked no different from thousands of other sheep born on 36 farms. But Dolly, as the world soon came to realize, was no 37 lamb. She was cloned from a single cell of an adult female sheep, 38 long-held scientific dogma that had declared such a thing biologically impossible. A decade later, scientists are starting to come to grips with just how different Dolly was. Dozens of animals have been cloned since that first lamb—mice, cats, cows and, most recently, a dog—and it’s becoming 39 clear that they are all, in one way or another, defective. It’s 40 to think of clones as perfect carbon copies of the original. It turns out, though, that there are various degrees of genetic 41. That may come as a shock to people who have paid thousands of dollars to clone a pet cat only to discover that the baby cat looks and behaves 42 like their beloved pet—with a different- color coat of fur, perhaps, or a 43 different attitude toward its human hosts. And these are just the obvious differences. Not only are clones 44 from the original template（模板）by time, but they are also the product of an unnatural molecular mechanism that turns out not to be very good at making 45 copies. In fact, the process can embed small flaws in the genes of clones that scientists are only now discovering. A) abstract B) completely C) deserted D) duplication E) everything F) identical G) increasingly H) miniature I) nothing J) ordinary K) overturning L) separated M) surrounding N) systematically O) tempting Section B Should Single-Sex Education Be Eliminated? [A] Why is a neuroscientist here debating single-sex schooling? Honestly, I had no fixed ideas on the topic when I started researching it for my book, Pink Brain, Blue Brain. But any discussion of gender differences in children inevitably leads to this debate, so I felt comp