警示灯工作时是频闪型的，它带光控、手控开关，()时自动善良，可控制5-10个灯闪烁。
A. 光线强
B. 光线亮
C. 光线暗
D. 白天
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______ is regarded as the most English of games.
A. Cricket
B. Soccer
C. Ruby
D. Tennis
In Britain only about______of the population are farmers but they manage 70% of the land area.
A. 2%
B. 3%
C. 4%
D. 5%
The national anthem(s)of Canada is/are
A. O Canada.
B. God Save the Queen.
C. O Canada and God Save the Queen.
D. O Canada and the Star Spangled Banner.
The ______ broke out in June 1950 and ended in the summer of 1953.
A. Vietnam War
B. Cold War
C. Korean War
D. Iraq War
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