[单项选择]Before the early 1950's, most historians who studied pre-industrial Europe had______.
A. used surveys that were statistical in nature
B. failed to distinguish between political and social elite
C. limited their work to a small portion of the population
D. relied heavily on birth, marriage, and death records

[单项选择]Before the early 1950's, most historians who studied pre-industrial Europe had______.


A. used surveys that were statistical in nature
B. failed to distinguish between political and social elite
C. limited their work to a small portion of the population
D. relied heavily on birth, marriage, and death records

[单项选择]Painters of the early twentieth century who were known primarily for they colorful landscapes, the Group of Seven changed is name to the Canadian Group of Painters in 1933.

[单项选择]Most of those who commit computer crimes will most likely ______.


A. be forced to leave their own country for other countries
B. commit suicide in order to escape punishment
C. be caught, sentenced and then put into prison
D. be highly recommended to another company

[单项选择]

Most people who travel long distances complain of jetlag (喷气飞行时差反应). Jetlag makes business travelers less productive and more prone (21) making mistakes. It is actually caused by (22) of your “body clock” a small cluster of brain cells that controls the timing of biological (23) The body clock is designed for a (24) rhythm of daylight and darkness, so that is thrown out of balance when it (25) daylight and darkness at the “wrong times in a new time zone. The (26) of jetlag often persist for days (27) the internal body clock slowly adjusts to the new time zone. Now a new antijetlag system is (28) that is based on proven (29) pioneering scientific research. Dr. martin Moore-Ede has (30) a practical strategy to adjust the body clock much sooner to the new time zone (31) controlled exposure to bright light. The time zone shift is easy to accomplish and eliminates (32) of the discomfo
A. diseases
B. symptoms
C. signs
D. defect