单选题It was not until almost a century ______ blacks began to demand their rights as American citizens.

单选题A new technique ______, the yields as a whole increased by 20 percent. A. working out B. having worked out C. having been worked out D. to have been worked out

单选题Tom doesn't think he could ever ______ what is called "free-style" poetry.

单选题The retired engineer plunked down $ 50, 100 in cash for a midsize Mercedes as a present for his wife—a purchase ______ with money made in the stock the week before.

单选题______ gave the second name of an Indian.

单选题My cousin hasn't decided _____to stay _____go home.

单选题 ______, he can now only watch it on TV at home.

单选题Just let it go ______ you don't want to be involved in any argument.

单选题All the staff in the office ______ their manager. A. unlike B. dislike C. alike D. unlikely

单选题我们应该给他一个改正自新的时机。

单选题He ______ to your home, for he doesn't know your address.

单选题______ both in working life and everyday living to different sets of values, and expectations places a severe strain on the individual.

单选题I think it was all fixed up by lawyers or ______ arranges adoptions.

单选题Consumer groups are {{U}}protesting against{{/U}} higher prices in this city now.

单选题 It is easy to miss amid the day-to-day headlines of global economic recession, but there is a less conspicuous kind of social upheaval (剧变) underway that is fast altering both the face of the planet and the way human beings live. That change is the rapid acceleration of urbanization. In 2008, for the first time in human history, more than half the world's population was living in towns and cities. And as a recently published paper shows, the process of urbanization will only accelerate in the densely to come—with an enormous impact on biodiversity and potentially on climate change. As Karen Seto, the lead author of the paper, points out, the wave of urbanization isn't just about the migration of people into urban environments, but about the environments themselves becoming bigger to accommodate all those people. The rapid expansion of urban areas will have a huge impact on biodiversity hotspots and on carbon emissions in those urban areas. Humans are the ultimate invasive species—when they move into new territory, they often dis-place the wildlife that was already living there. And as land is cleared for those new cities—especially in the dense tropical forests—carbon will be released into the atmosphere as well. It's true that as people in developing nations move from the countryside to the city, the shift may reduce the pressure on land, which could in turn be good for the environment. This is especially so in desperately poor countries, where residents in the countryside slash and bum forests each growing season to clear space for fanning. But the real difference is that in developing nations, the move from rural areas to cities often leads to an accompanying increase in income—and that increase leads to an increase in the consumption of food and energy, which in turn causes a rise in carbon emissions. Getting enough to eat and enjoying the safety and comfort of living fully on the grid is certainly a good thing—but it does carry an environmental price. The urbanization wave can't be stopped—and it shouldn't be. But Seto's paper does underscore the importance of managing that transition. If we do it the right way, we can reduce urbanization's impacts on the environment. 'There's an enormous opportunity here, and a lot of pressure and responsibility to think about how we urbanize,' says Seto. 'The one thing that's clear is that we can't build cities the way we have over the last couple of hundred years. The scale of this transition won't allow that.' We're headed towards an urban planet no matter what, but whether it becomes heaven or hell is up to us.

单选题______ is more important than ______.

单选题Such policies have also enabled companies such as McMullens to take advantage of recession- ary periods rather than be forced into taking______ measures.

单选题If prisoners behave well they are allowed the ______ of visiting their families at the weekend.

单选题Some forgeries are intended to confound or ridicule the expels; others are intended to imitate an artist or genre.