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If a person's eye has been looking at an object in bright sunlight for some time, and then
A. a time lag in the focusing ability of the eye
B. the immediate loss of the "afterimage" of the first object
C. some inability' to see colors of the latter-named objects until loss of sensitivity has been regained
D. adaptation in the central area of the eye but little adaptation in the lateral areas to the new intensity level
平面直角坐标系中，A(3，5)，B(a，7)，C(-1，6)三点共线。
A. 条件(1)充分，但条件(2)不充分。
B. 条件(2)充分，但条件(1)不充分。
C. 条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分。
D. 条件(1)充分，条件(2)也充分。
E. 条件(1)和(2)单独都不充分，条件(1)和条件(2)联合起来也不充分。
According to the Chinese tradition, dining is not only a way to fill one's stomach but also a ______ .
A. revolution
B. trend
C. ceremony
D. waste
The best title for the passage may be ______.
A. Stop Shootin', Start Thinkin', and Keep Livin'
B. Efforts to Fight against Gun Crimes
C. A Mission to Revitalize the City
D. Violent Murders in Newark
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