The two major shifts the U.S. population is undergoing are changes in geographic distribut

Lavare,local in the Chicago suburbs, is a major manufacturer of stainless steel sinks. Lavare is in the middle of the demand and supply planning exercise for the coming year. Anticipated monthly demand from distributors over the 12 months is shown in Table 9-4. Capacity at Lavare is governed by number of machine operators it hires. The firm works 20 days a month, with a regular operating shift of eight hours per day. Any time beyond that is considered overtime. Regular-time pay is $15 per hour and overtime is $22 per hour. Overtime is limited to 20 hours per month per employee. The plant currently has 250 employees. Each sink requires two hours of labor input. It costs $3 to carry a sink in inventory for a month. Materials cost per sink is $40. Sinks are sold to distributors at a price of $125 each. We assume that no stockouts are allowed and the starting inventory entering January is 5,000 units and the desires ending inventory in December is also 5,000 units. Market research has indicated that a promotion dropping prices by 1 percent in a given month will increase sales in that month by 20 percent and bring forward 10 percent demand from each of the following two months. Thus, a 1 percent drop in price in March TABLE 9-4 Anticipated Monthly Demand at Lavare Month Demand Forecast Month Demand Forecast January 10,000 July 31,000 February 11,000 August 28,000 March 16,000 September 22,000 April 19,000 October 19,000 May 22,000 November 13,000 June 25,000 December 12,000 by 3,000 (=0.2 X 15,000) and shifts 1,800 (=0.1 X 18,000) units in demand from April and 2,500 (=0.1 X 25,000) units from May forward to March. a. What is the optimal production plan for the year if we assume no promotions？ What is the cost of this plan？ b. It is better to promote in April or July？ How much increase in profit can be achieved as a result？ c. If sinks are sold for $250 instead of $125., does the decision about the timing of the promotion change？ Why？

According to the passage, body temperature________

A. plays a vital role in selecting people for alternative day and night shifts

B. changes every two hours during the day and every three hours during the night

C. has been used for industries in selecting people for alternative shifts

D. changes after a person has finished the training for alternative shifts

According to the passage, body temperature________

A.plays a vital role in selecting people for alternative day and night shifts

B.changes every two hours during the day and every three hours during the night

C.has been used for industries in selecting people for alternative shifts

D.changes after a person has finished the training for alternative shifts

Section B

Directions: There are 2 passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A, B, C and D. You should decide on the best choice.

An accidental discovery has brought seismologists(地震学家) one step closer to being able to predict earthquakes. As part of an unrelated effort to measure underground changes caused by shifts in barometric pressure (大气压力), a team of researchers found that increases in subterranean pressure(地下压力) preceded earthquakes along California's San Andreas Fault(断层) by as much as 10 hours. If follow-up tests advance the findings, seismologists may eventually be able to provide a few hours' notice for people to find safe places prior to quakes.

Researchers used a high-tech equivalent of a stereo speaker lowered into a bore hole near Parkfield, Calif., a half-mile deep and five yards from a measuring device. For two months beginning in late 2005, researchers transmitted pulse signals three times per second, from the speaker to the measuring device, calculating travel time between the two stations. Surprised scientists learned the seismic waves slowed dramatically on only two occasions: two hours prior to a magnitude-1 temblor (地震), and a startling 10 hours before a magnitude-3 quake.

The research team theorizes that the immense amount of pressure building along the fault causes small cracks within the rock during the final hours before an earthquake, increasing rock density and slowing the transmission signals. "The more cracks you have, the slower the seismic velocity," says study co-author Paul Silver, a geophysicist with the Carnegie Institution of Washington. Still unknown is whether there is any significance to the fact that the magnitude-3 quake had a much longer pre-seismic signal than the lower-magnitude quake, or whether it was simply because its magnitude was larger and its epicenter closer to the sensors.

If scientists can flesh out the new findings during future earthquakes — a two-year study at the same seismically active location begins this September — it could form. the basis of a vastly improved early-warning system for quakes. Current earthquake-warning systems give just a few seconds' notice because they detect only waves, the fast-moving seismic waves that precede the more destructive waves released during a quake. Upgrading to a seismic stress meter, however, is still a long way of{. Researchers hope to test whether the stress signals would still be detectable on a larger scale, with the two sensors spaced more than a few yards apart.

Barring a major effort to drill multiple, half-mile-deep holes along fault lines, researchers would also need to develop a surface-based detection system capable of filtering out temperature swings and other "noise" that could confuse their seismic readings.

The passage mainly tells us about ______.

A．the importance of predicting earthquakes

B．a new method to predict earthquakes

C．the great damages caused by earthquakes

D．a traditional method to predict earthquakes

A.Misinterpreting.

B.Overlooking.

C.Overthinking.

D.Misspelling.

LTE OMC包含的两大部分包括『____』与『____』。(LTE OMC contains two major parts, including 『____』and『____』.)