[单项选择]This doesn’t mean that wind and solar, which currently provide less than 1 percent of the world’s primary energy, will replace fossil fuels, which provide 82 percent. In fact, while companies like BP and Shell are cutting back on commercial projects in wind and solar, Big Oil is taking a closer look at how they might be used to increase efficiency internally, or to flee up increasingly profitable fossil fuels, like natural gas, for commercial sale. For example. Valero is building windmills to power refineries, and Chevron is using solar power to make steam to extract tough-to-reach oil. When you consider that the top 15 oil and gas companies have a market capitalization of $1.9 trillion, it’s clear that these firms themselves have the potential to be major renewable customers.
Big oil is thinking of using wind and solar
A. to free up fossil fuels for commercial sale.
B. to replace fossil fuels for commercial sale.
C. to increase efficiency of fossil fuels use.
D. to reduce harm to the environment.

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[单项选择]Passage Four
The frog is an amphibian, which means "double living" or both water and land living. That is, it is able to get oxygen from water at one stage in its life and from the air at another stage. Perhaps you have heard the term amphibian used for military vehicles which can travel on both land and water. Toads and salamanders, as well as frogs, are amphibians. In the development of animals over the world’s history, amphibians were the first vertebrates to live at least part time on land.
As a tadpole, the frog spends the beginning of its life living in the water. The tadpole breathes by means of tiny gills. When the lungs begin to develop, the gills disappear. By the time they are adults, all frogs have lungs for breathing while on land. In this way, the animal becomes essentially a land-adapted animal.
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[单项选择]Which is both the mean and the median of 5 consecutive integers the least of which is x
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[简答题]Mean

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[单项选择]Passage Four

Tile media can impact current events. As a graduate student at Berkeley in the 1960s, I re member experiencing the events related to the People’s Park that were occurring on campus. Some of these events were given national media coverage in the press and on TV. I found it interesting to compare my impression of what was going on with perceptions obtained from the news media．I could begin to see events of that time feed on news coverage. This also provided me with some healthy insights into the distinctions between these realities.
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[单项选择]Liabilities are usually classified as either current or noncurrent liabilities. Current liabilities are those obligations whose (61) is reasonably expected to require the use of existing resources properly classified as current (62) , or the creation of other current liabilities. This definition of current liabilities emphasizes a short-term creditor’s claim to working capital rather than to the due date for (63) purposes. Accounts payable, dividends payable, salaries payable, and taxes payable are examples of current liabilities. Liabilities which are not current liabilities are (64) as noncurrent or long-term liabilities. Bonds payable and mortgages payable are examples of (65) liabilities.
A. referred to B. distributed C. divided D. seen

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