[单项选择]Buses offered a more flexible service than trolleys, because they were not restricted to operating only on fixed tracks. General Motors acquired many of the privately owned streetcar companies and replaced the trolleys with buses that the company made. But bus ridership has declined from a peak of 11 billion riders per year in the late 1940s to 5 million in the 1990s. Commuter railroad service, like trolleys and buses, has also been drastically reduced in most U.S. cities. The one exception to the downward trend in public transportation in the United States is the subway, now known to transportation planners as fixed heavy rail. Cities such as Boston and Chicago have attracted new passengers through construction of new lines and modernization of existing service. Chicago has been a pioneer in the construction of heavy-rail rapid transit lines in the median strip of expressways. Entirely new subway systems have been built in recent years in a number of U.S. cities, including Atlanta
A. the rise of bus fares
B. the increased number of private cars
C. the improvement of the commuter railroad service
D. the poor condition of the transportation infrastructure

[单项选择]Buses offered a more flexible service than trolleys, because they were not restricted to operating only on fixed tracks. General Motors acquired many of the privately owned streetcar companies and replaced the trolleys with buses that the company made. But bus ridership has declined from a peak of 11 billion riders per year in the late 1940s to 5 million in the 1990s. Commuter railroad service, like trolleys and buses, has also been drastically reduced in most U.S. cities. The one exception to the downward trend in public transportation in the United States is the subway, now known to transportation planners as fixed heavy rail. Cities such as Boston and Chicago have attracted new passengers through construction of new lines and modernization of existing service. Chicago has been a pioneer in the construction of heavy-rail rapid transit lines in the median strip of expressways. Entirely new subway systems have been built in recent years in a number of U.S. cities, including Atlanta
A. Commuter railroad service, trolleys and buses have been reduced in the U.S.
B. Subways have largely been maintained.
C. Fares usually can not cover operating costs.
D. U. S. officials think it worthwhile to subsidize public transportation.

[填空题]The UK is a country that is ______.

[填空题]More people are employed in service sections than in manufacturing ones.

[单项选择]Communication orally involves more than reading or talking, gesture, posture, movements may all be______to it.
A. intrinsic
B. coherent
C. appealing
D. submissive

[单项选择]Communicating orally involves more than reading or talking: gesture, posture, movements may all be ______ to it.
A. intrinsic
B. coherent
C. appealing
D. submissive

[填空题]There have been men for more than

[填空题]Overprotective parents inhibit more than their kids’ freedom: they may also slow brain growth in an area linked to mental illness. Children whose parents are overprotective or neglectful are believed to be more susceptible to psychiatric disorders—which in turn are associated with defects in part of the prefrontal cortex.
To investigate the link, Kosuke Narita of Gunma University, Japan, scanned the brains of 50 people in their 20s and asked them to fill out a survey about their relationship with their parents during their first 16 years. The researchers used a survey called the Parental Bonding Instrument, an internationally recognized way of measuring children’s relationships with their parents. It asks participants to rate their parents on statements like "Did not want me to grow up", "tried to control everything I did" and "tried to make me feel dependent on her/him". Narita’s team found that those with overprotective parents had less grey matter in a particular area of the