According to the passage, successful game strategy depends on ______.
A. the ability to adjust one's behavior in light of the behavior of others
B. the degree of stability one can create in one's immediate environment
C. the accuracy with which one can predict future events
D. the success one achieves in conserving and storing one's resources
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据海关统计，2012年1-7月，我国进出口总值21683.7亿美元。其中，出口11312.4亿美元，进口10371.3亿美元，请问2012年1-7月我国外贸进出口（ ）亿美元。
A. 顺差941.1
B. 逆差11312.4
C. 顺差10371.3
D. 逆差941.1
假定某国净贸易条件以1990年为基期是100，2000年出口价格指数下降10%，为90；进口价格指数上升20%，为120，且该国的出口商品的劳动生产率从1990年的100提高到2000年的150，而进口商品的劳动生产率则从1990年的100提高到2000年的110，则2000年该国家的双项因素贸易条件是（ ）。
A. 112.50
B. 108.57
C. 107.14
D. 102.27
It can be inferred from the passage that the author considers Fisher's work to be ______.
A. definitive and thorough
B. inaccurate but popular, compared with Hamilton's work
C. accurate, but trivial compared with Hamilton's work
D. admirable, but not as up-to-date as Hamilton's work
During the Middle Ages, productivity of labor ______.
A. was a primary concern of society
B. was hampered by class relationships
C. began to improve over levels reached by the Greeks
D. was in a period of technical progress
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