这题我也倾向于C了,不得不服闹闹——以前选B是因为把be动词省略原则记成必须同一主语了 今天特地翻了语法书才发现自己记错了。 1.关于it指代问题:A of B的结构中,没有说代词一定要指代核心词!所以我认为不能因为指代问题排除B——欢迎讨论 2.be动词省略原则:两个句子并列,第一个句子含有be动词或者become,第二个句子中的be动词或者become必须省略。引自白勇的语法书。我认为此处is和are都属于be动词,性质相同,可以省略。 3.little of的用法觉的有错误,字典上没有little of的用法。 prep9 9 The investigations of many psychologist and anthropologists support the generalization of there being little that is a significant difference in underlying mental processes manifested by people from different culture. A of there being little that is a significant difference B of there being little that is significantly different C of little that is significantly different D that there is little that is significantly different E that there is little of significant differences 此题答案D 也是用了little而不是little of 4.were it to do so:此处是虚拟语气,if it were to do so。我认为错在were to do原因和闹闹讲得一样。 附:Not Always Nice - glacier research Such as that glacier in Alaska. When a glacier moves, it doesn't scrape across the ground like a toboggan on a dry spot. No one knows for certain what causes it to move at all, typically at a languorous pace. The most plausible explanation is that the sheer force of gravity causes the mass of ice to subtly change shape like cold molasses as it slumps along. But other forces may be at work when a glacier tears off at a gallop. "During a typical surge, glaciers appear to suffer from a failure of their internal plumbing," says Harrison. Normally, meltwater bubbles out from internal crevices and exits from a natural downspout at the glacier's base. But when the downspout is clogged, the meltwater backs up until the entire glacier surges down the slope on a thin layer of water and sediment. The more puzzling question is why a common patch of ice is slippery. "That's still controversial," says Ashton. One theory is that pressure builds up within the ice and creates a thin film of water that greases the surface. Another is that ice emits vapor, so that other solids actually float, rather than slide, along the surface. A third possibility is that the top atomic layer of ice is disordered so the atoms act like a box of marbles and let other solids slide across them. Ice remains a source of mystery because of the unruly behavior of [H.sub.2]O molecules. In gas form, they behave as individuals, single and fancy-free. As water, they form a complicated, ever changing lattice with ties that continuously snap, reconnect, and snap again. As ice, the molecules assume a crystal formation, placing themselves farther away from each other, and even though these bonds are relatively stationary, they are easily broken. Unlike most solids, ice liquefies under pressure even at subzero temperatures and refreezes as soon as the pressure is lifted. Hence a loop of wire can be pulled through a solid block of ice and the ice will immediately refreeze behind it. This process of regelation--thawing and refreezing according to variance in pressure rather than temperature--takes place inside a glacier all the time. But the exact dynamics of such shape-shifting have eluded scientists. [H.sub.2]O molecules perform a host of other tricks when they bond together as ice. To begin with, the molecular structure expands by a volume of 9 percent as it freezes, creating a solid bigger and lighter than water. Plus, in the process of bonding, the molecules force out other substances. As seawater freezes, the ice crystals expel droplets of concentrated brine that are eventually pulled down by gravity into the water below, leaving the ice at the top 99 percent pure. In fact, Eskimos depend on sea ice as their source of fresh water. Pure ice is transparent, but the air bubbles in fresh snow reflect light, a fact that is essential to life as we know it. Antarctica receives more sun radiation than anywhere else on Earth, yet the temperatures are so cold and the ice cap so reflective that minimal ice melt occurs each summer. Otherwise, the water levels of the oceans would rise by 250 feet and engulf most of the world's great cities. |