A shortage of orders for Manto Aircraft's airliners has led analysts to predict that
the manufacturer will have to lay workers ,the new order that consolidated
airlines has just made for 20 of Manto's model TX jets does not provide a reason
for the analysts to revise their predictions ,because simultaneously with its new
order , consolidated canceled its existing order for an equal number of manto's
larger, more expensive model Z jets
which of the following ,if true, most seriously weakens the argument?
Manto relies more heavily on outside subcontractors to provide the labor to manufacture the Model Z than it does the Model TX
The Manto employees who currently work to manufacture the model Z are Not proficient at manufacturing the model TX
Manto includes all required maintenance work for the first five years in the price of each jet it sells .
Manto has had to lay off workers several times within the past ten years but has typically rehired many of the workers when it subsequently received new orders
A large number of the airliners in consolidated is fleet are at the beginning of their expected service life
为什么选E
Which of the following most logically completes the passage?
Concerned about financial well-being of its elderly citizens, the government of Runagiadecided two years ago to increase by 20 percent the government-provided pensionpaid to all Runagians over 65. Inflation in the intervening period has been negligible,and the increase has been duly received by all eligible Runagians. Nevertheless,many of them are no better off financially than they were before the increase, in large part because ________. [table=undefined][tr][td][td][tr][td] [td]They rely entirely on the government pension for their income [tr][td][td][tr][td] [td]Runagian banks are so inefficient that it can take up to three weeks to cash a pension check [tr][td][td][tr][td] [td]They buy goods whose prices tend to rise especially fast in times of nflation [tr][td][td][tr][td] [td]The pension was increased when the number of elderly Runagians below he poverty level reached an all-time high [tr][td][td][tr][td] [td]In Runagia children typically supplement the income of elderly parents, but only by enough to provide them with a comfortable living E不懂Plankton generally thrive in areas of the ocean with sufficient concentrations of certain nitrogen compounds near the surface, where plankton live. Nevertheless, some areas, though rich in these nitrogen compounds, have few plankton. These areas have particularly low concentrations of iron, and oceanographers hypothesize that this shortage of iron prevents plankton from thriving. However, an experimental release of iron compounds into one such area failed to produce a thriving plankton population, even though local iron concentrations increased immediately. Which of the following, if true, argues most strongly against concluding, on the basis of the information above, that the oceanographers' hypothesis is false?
[table=undefined][tr][td][td][tr][td] [td]Not all of the nitrogen compounds that are sometimes found in relatively high concentrations in the oceans are nutrients for plankton. [tr][td][td][tr][td] [td]Certain areas of the ocean support an abundance of plankton despite having particularly low concentrations of iron. [tr][td][td][tr][td] [td]The release of the iron compounds did not increase the supply of nitrogen compounds in the area. [tr][td][td][tr][td] [td]A few days after the iron compounds were released, ocean currents displaced the iron-rich water from the surface. [tr][td][td][tr][td] [td]The iron compounds released into the area occur naturally in areas of the ocean where plankton thrive.
D
[/td]
[/td]Which of the following most logically completes the argument? A certain cultivated herb is one of a group of closely related plants that thrive in soil with high concentrations of metals that are toxic to most other plants. Agronomists studying the herb have discovered that it produces large amounts of histidine, an amino acid that, in test-tube solutions, renders these metals chemically inert.  ossibly, therefore, the herb's high histidine production is what allows it to grow in metal-rich soils, a hypothesis that would gain support if ______.
[table=undefined][tr][td][td][/td][tr][td] [/td][td]histidine is found in all parts of the plant—roots, stem, leaves, and flowers [/td][/tr][tr][td][td][/td][tr][td] [/td][td]the herb's high level of histidine production is found to be associated with an unusually low level of production of other amino acids [/td][/tr][tr][td][td][/td][tr][td] [/td][td]others of the closely related group of plants are also found to produce histidine in large quantities [/td][/tr][tr][td][td][/td][tr][td] [/td][td]cultivation of the herb in soil with high concentrations of the metals will, over an extended period, make the soil suitable for plants to which the metals are toxic [/td][/tr][tr][td][td][/td][tr][td] [/td][td]the concentration of histidine in the growing herb declines as the plant approaches maturity
B
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发表于 2009-11-23 16:59:15
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