Brand R coffee costs $3. 25 per pound and brand T coffee costs $ 2. 50 per pound.
Column A Column B
The number of pounds of brand R in a 1. 2
mixture of brands R and T that costs
$3. 00 per pound
A．if the quantity in Column A is greater
B．if the quantity in Column B is greater
C．if the two quantity are equal
D．if the relationship cannot be determined from the information given
相关问题推荐
-
SOPORIFIC:
A．effectual treatment
B．false sustenance
C．tonic
D．illusory event
E．supplement -
回答第13空。
-
All of the following statements are supported by the passage EXCEPT__
A．True bacteria form. a distinct evolutionary group.
B．Archaebacteria are prokaryotes that resemble true bacteria.
C．True bacteria and eukaryotes employ similar types of genetic coding.
D．True bacteria and eukaryotes are distinguishable at the subcellular level.
E．Amino acid sequences of enzymes are uniform. for eukaryotic and prokaryotic organisms. -
A meteor stream is composed of dust particles that have been ejected from a parent comet at a variety of velocities. These particles follow the same orbit as the parent comet, but due to their differeing velocities they slowly gain on or fall behind the disintegrating comet until a shroud of dust surrounds the entire cometary orbit.
Astronomers have hypothesized that a meteor stream should broaden with time as the dust particles’ individual orbits are perturbed by planetary gravitational fields. A recent computer-modeling experimetn tested this hypothesis by tracking the influence of planetary gravitation over a projected 5,000-year period on the positions of a group of hypothetical dust particles. In the model, the particles were randomly distributed throughout a computer simulation of the orbit of an actual meteor stream, the Geminid. The researcher found, as expected, that the computer-model stream broadened with time. Coventional theories, however, predicted that the distribution of particles would be increaingly dense toward the center of a meteor stream. Surpringly, the computer-model meteor stream gradually came to resemble a thick-walled, hollow pipe.
Whenever the Earth passes through a meteor stream, a meteor shower occurs. Moving at a little over 1,500,000 miles per day around its orbit, the Earth would take, on average, just over a day to cross the hollow, computer-model Geminid stream if the stream were 5,000 years old. Two brief periods of peak meteor activity during the shower would be observed, one as the Earth entered the thick-walled “pipe” and one as it exited.
There is no reason why the Earth should always pass through the stream’s exact center, so the time interval between the two bursts of activity would vary from one year to the next.
Has the predicted twin-peaked activity been observed for the actual yearly GEminid meteor shower？ The Geminid data between 1970 and 1979 show just such a bifurcation, a secondary burst of meteor activity being clearly visible at an average of 19 hourse （1,200,000 miles) after the first burst. The time intervals between the bursts suggest the actual Geminid stream is about 3,000 years old.
The primary focus of the passage is on which of the following？
A．Comparing two scientific theories and contrasting the predictions that each would make concerning a natural phenomenon
B．Describing a new theoretical model and noting that it explains the nature of observations made of a particular natural phenomenon
C．Evaluating the results of a particular scientific experiment and suggesting further areas for research
D．Explaining how two different natural phenomena are related and demonstrating a way to measure them
E．Analyzing recent data derived from observations of an actual phenomenon and constructing a model to explain the data -
Excess inventory, a massive problem for many busi-
nesses, has several causes, some of which are unavoidable.
Overstocks may accumulate through production overruns or
errors. Certain styles and colors prove unpopular. With
（5) some products—computers and software, toys, and
books—last year’s models are difficult to move even at
huge discounts. Occasionally the competition introduces a
better product. But in many cases the public’s buying tastes
simply change, leaving a manufacturer or distributor with
（10 ) thousands （or millions) of items that the fickle public no
longer wants.
One common way to dispose of this merchandise is to
sell it to a liquidator, who buys as cheaply as possible and
then resells the merchandise through catalogs, discount
（15) stores, and other outlets. However, liquidators may pay less
for the merchandise than it cost to make it. Another way to
dispose of excess inventory is to dump it. The corporation
takes a straight cost write-off on its taxes and hauls the
merchandise to a landfill. Although it is hard to believe,
（20) there is a sort of convoluted logic to this approach. It is
perfectly legal, requires little time or preparation on the
company’s part, and solves the problem quickly. The draw-
back is the remote possibility of getting caught by the news
media. Dumping perfectly useful products can turn into a
（25) public relations nightmare. Children living in poverty are
freezing and XYZ Company has just sent 500 new snow-
suits to the local dump. Parents of young children are
barely getting by and QPS Company dumps 1,000 cases of
disposable diapers because they have slight imperfections.
（30) The managers of these companies are not deliberately
wasteful; they are simply unaware of all their alternatives.
In 1976 the Internal Revenue Service provided a tangible
incentive for businesses to contribute their products to char-
ity. The new tax law allowed corporations to deduct the
（35)cost of the product donated plus half the difference
between cost and fair market selling price, with the proviso
that deductions cannot exceed twice cost. Thus, the federal
government sanctions—indeed, encourages—an above-cost
federal tax deduction for companies that donate inventory
to charity.
The author mentions each of the following as a cause of excess inventory EXCEPT__
A．production of too much merchandise
B．inaccurate forecasting of buyers’ preferences
C．unrealistic pricing policies
D．products’ rapid obsolescence
E．availability of a better product