A．Demand for operator-assisted calls is increasing dramatically.
B．The new electronic operator system, though it has been tested, is expected to require significant adjustments before it can become fully operational.
C．The operators union would be quick to strike the companies involved if operators were dismissed during the current contract period.
D．In one regional trial of the electronic system, virtually all consumers, given a choice, preferred a human operator to an electronic one.
E．The new electronic operator system will complete operator-assisted calls twice as fast as human operator can.

A．The shape of compact cars makes it easy for a tailgater to see far enough ahead around such cars to minimize the chances of a rear-end collision.
B．Middle-sized cars, owned by families with children and pets, are likely to have bumper stickers that are so interesting to read that tailgaters stay behind such cars longer.
C．Compact cars sometimes have superior engines that allow them to pass middle-sized cars on the highway easily.
D．The percentage of cars on the highway that are middlesized has been steadily decreasing over the last decade.
E．Compact cars are often driven by fast drivers.

A．County businesses can operate only with a permit, and during each day of processing they lose any income they might have generated.
B．The permit office considers that processing begins after the interview, whereas the applicants consider that processing begins when they have submitted an application.
C．There are fewer applicants for permits in the county since the permit office instituted the changes.
D．Computer-readable forms have reduced the time necessary for the permit office to verity the statements made on applications and have thus reduced the amount of time an interview takes.
E．The format of the application has not changed since the permit office began recording applications on the computer.

A．Foreign investors usually buy United States stocks only when prices are low.
B．The number of stock buyers in 1987 remained about the same as it had been the preceding year.
C．For some portion of 1987, the volume of stocks traded was higher than the average for that year.
D．The greater the volume of stocks traded in a given year, the lower the average price per share on the United States stock market for that year.
E．The volume of stocks traded rises and falls in predictable cycles.

A．During periods of economic slowdown, two-year community colleges are more likely than four-year colleges to prepare their students for the jobs that are still available.
B．During periods of economic prosperity, graduates of two-year community colleges often continue their studies at four-year colleges.
C．Tuition at most two-year community colleges is a fraction of that at four-year colleges.
D．Two-year community colleges devote more resources than do other colleges to attracting those students especially affected by economic slowdowns.
E．Students at two-year community colleges, but not those at most four-year colleges, can control the cost of their studies by choosing the number of courses they take each term.

A．the minimum acceleration in physical growth that would indicate adolescence might differ according to species
B．the fossil record, though steadily expanding, will always remain incomplete
C．detecting the adolescent growth spurt requires measurements on the same individual at different ages
D．complete skeletons of extinct hominids are extremely rare
E．human beings might be the first species to benefit from the survival advantages, if any, conferred by adolescence

A．Sales of higher-priced houses were unaffected by the sales drop because their purchasers have fewer constraints limiting the total amount they pay.
B．Labor agreements of builders with construction unions are not due to expire until the next January.
C．The prices of new houses have been rising slowly over the past three years because there is an increasing shortage of housing.
D．There was a greater amount of moderate-priced housing available for resale by owners during January than in the preceding three months.
E．Interest rates for home mortgages are expected to rise sharply later in the year if predictions of increased business activity in general prove to be accurate.

A．the value of a car that is bought new declines much more rapidly than does the value of a car that is bought used
B．after someone has bought a car, it might be several years before that person next buys a car
C．a decline in the proportion of car buyers who buy new cars must necessarily mean that the proportion who buy used cars has increased
D．the relative increase in used-car sales might be explained by the decisions of only a small proportion of all car buyers
E．the change in the average price paid for a new car could result solely from more people’s rejecting inexpensive new cars in favor of used cars

A．The type of music most popular for use in commercials has changed from a type that requires a large number of instruments to a type that requires very few instruments.
B．There has been an increase in the number of commercials that use only the spoken word and sound effects, rather than musical accompaniment.
C．There has been an increase in the number of commercials that use a synthesizer, an instrument on which one musician can reproduce the sound of many musicians playing together.
D．There has been an increase in the number of commercials that use prerecorded music as their only source of music.
E．There has been an increase in the number of commercials that use musicians just starting in the music industry rather than musicians experienced in accompanying commercials.

A．Prices for palm fruit fell between 1980 and 1984 following the rise in production and a concurrent fall in demand.
B．Imported trees are often more productive than native trees because the imported ones have left behind their pests and diseases in their native lands.
C．Rapid increases in productivity tend to deplete trees of nutrients needed for the development of the fruit-producing female flowers.
D．The weevil population in Asia remained at approximately the same level between 1980 and 1984.
E．Prior to 1980 another species of insect pollinated the Asian palm trees, but not as efficiently as the species of weevil that was introduced in 1980.