[单项选择]

Although there are obviously cultural (45) for the differences in emotions and behavior, (46) breakthrough research reveals that the (47) of many puzzling differences between men and women may (48) in the head. Men’s and women’s brains (49) much in common, but they are definitely not the same (50) size, structure or insight. Broadly speaking, a woman’s brain, like her body, is ten to fifteen percent smaller than a man’s, (51) the regions dedicated to language may be more densely (52) with brain cells.
Girls generally speak earlier and read faster. The reason may be (53) females use both sides of the brain when they read. In (54) , males rely only on the left side.At every age, women’s memories (55) men’s. They have a greater ability to (56) names with faces than men do, and they are (57) at recalling list. The events peopl
A. which 
B. who 
C. that 
D. why

Although there are obviously cultural (45) for the differences in emotions and behavior, (46) breakthrough research reveals that the (47) of many puzzling differences between men and women may (48) in the head. Men’s and women’s brains (49) much in common, but they are definitely not the same (50) size, structure or insight. Broadly speaking, a woman’s brain, like her body, is ten to fifteen percent smaller than a man’s, (51) the regions dedicated to language may be more densely (52) with brain cells.
Girls generally speak earlier and read faster. The reason may be (53) females use both sides of the brain when they read. In (54) , males rely only on the left side.At every age, women’s memories (55) men’s. They have a greater ability to (56) names with faces than men do, and they are (57) at recalling list. The events peopl
A. senses 
B. reasons 
C. purposes 
D. meanings

Consumers and producers obviously make decisions that mold the economy, but there is a third major element to consider the role of government. Government has a powerful effect on the economy in at least four ways:
Direct Services. The postal system, for example, is a federal system serving the entire nation, as is the large and complex military establishment. Conversely, the construction and maintenance of most highways is the responsibility of the individual states, and the public educational systems, despite a large funding role by the federal government, are primarily paid for by county or city governments. Police and fire protection and sanitation services are also the responsibilities of local government.
Regulation and Control. The government regulates and controls private enterprise in many ways, for the purpose of assuring that business serves the best interests of the people as a whole. Regulation is necessary in areas where private enterprise is granted
A. promoting the growth of the national economy
B. assuring the business serves the best interests of the people
C. eliminating unfair competitions
D. fighting against the competitions from foreign countries